CSRSRV.dll is not a valid windows image... system does not start

Similar Questions

• get a pop-up message "c:\windows\system32\ms32clod.dll is not a valid windows image.

  I get a pop up message "c:\windows\system32\ms32clod.dll is not a valid windows image" every time I start up windows XP.

  Can anyone suggest a solution please?
  Thank you
  Teabag123
  Hello
  • What were the changes made before the issue started?
  I suggest you return these methods:
  Method 1:
  I suggest you make a system full scan just to be sure.
  http://www.Microsoft.com/security/scanner/en-us/default.aspx
  Note: The data files that are infected must be cleaned only by removing the file completely, which means that there is a risk of data loss.
  Method 2:
  a. click Start, click run, type System32.
  b. enter OK
  c. find mcenspc.dll
  d. right-click on the file, then click on Remove.
  e. restart the computer.

• The application or the DLL C:\Program Files\Mozilla Firefox\MOZCRT19.dll is not a valid Windows image. Please check this against your installation diskette

  The application or the DLL C:\Program Files\Mozilla Firefox\MOZCRT19.dll is not a valid Windows image. Please check this against your installation diskette.
  Help, please. I was unistalling firefox and reinstall them again at least 10 times, but still does not solve the problem

  This has happened

  Each time Firefox opened

  few days back

  User Agent

  Mozilla/4.0 (compatible; INTERNET EXPLORER 6.0; Windows NT 5.1; SV1; InfoPath.2)

  I have the same problem

  deleted expletives - Maurane

• How to fix the application or DLL C:\WINDOWS\system32\SensApi.dll is not a valid Windows image. Please check this against your installation diskette.

  I got the message "the application or DLL C:\WINDOWS\system32\SensApi.dll is not a valid Windows image. Please check this against your installation diskette. "When I click on Start, point to programs, point to Accessories, point to System Tools, and then click Activate Windows.

  Thank you!

  The question that I already fixed. As your mentioned before, I have download SensApi.dll and stuck to C:\WINDOWS\system32\.

  After that click on Start, run and type regsvr32 sensapi.dll and then press enter.

  Restart your computer, it works now from.

• Error message - browseui.dll file is not a valid Windows image in the Windows XP computer.

  Original title: how to fix browseui.dll without original windows disc?

  Hello

  Well, kids, here's the deal.

  I myself locked out of my computer and installed PC login now erase my passwords. It has worked flawlessly, and I now have my computer back after months and months.

  There was only a single small strangeness: whenever I connected my computer, he asked me to check my drive. Looking forward to get my computer and running and customized how I like it, I bypassed it the first few times. Then, when I had a few minutes, I thought I had better let the disk check, so I left it.

  NOW, when I turn on my computer, I get an error message that my browseui.dll file is not a valid windows image and my windows Explorer does not work. So I've been doing on the web looking for a solution via the Task Manager, which is a pain. Someone suggested to use the scannow in the command prompt command line, so I tried, but it requires my disk of windows XP which I think can be in a different State with my mother.  So I simply bypassed it whenever he had the drive and VOILA! all peachy.

  Until, that is, I turn on my computer again. We're back in the same place.  Well, this analysis running and without going through the disc each time took me about an hour, and I can't do that whenever I need to use my computer.

  I tried the system restore, no change. I tried from the command prompt and choose a date AND choose "last good configuration" in the menu f12 or f8.  Without peanut.

  We are this:

  1. is there a way to correct this file without the disc?

  2. can I get another copy of the disk without having to buy it?

  3. Although I'm not PARTICULALRY, would be the Windows 7 upgrade solves the problem? (But I really like my XP...)

  If the c:\windows\system32\browseui.dll file is damaged or missing, Explorer.exe does not start and you may see a message like this:

  If the c:\windows\system32\browseui.dll file is corrupted, Explorer.exe does not start and you will see a message like this:

  Explorer.exe - bad Image
  The application or DLL C:\WINDOWS\system32\BROWSEUI.dll is not a valid Windows image.  Please check this against your installation diskette.

  You can click OK and get to an empty office with only your display background image but still be able to maneuver with the Task Manager.

  If missing the c:\windows\system32\browseui.dll file, Explorer.exe does not start and you will see a message like this:

  Explorer.EXE - unable to locate component: this application has failed to start because BROWSEUI.dll was not found. Reinstalling the application may fix this problem.

  You can click OK and get to an empty office with only your display background image but still be able to maneuver with the Task Manager.

  Since we know that XP keeps copies of critical system files in the dllcache folder, you can use the Task Manager to replace the file missing or distressed.

  From the Task Manager, click file, new task (run...) and then click Browse and navigate to the c:\windows\system32\dllcache folder.  Make sure the "Files of type" box is set to show all files (or you will not see any), and then click OK to display all files.

  Locate the copy of the browseui.dll file backup in the folder c:\windows\system32\dllcache, made right click and copy and go back up a folder c:\windows\system32, right-click in an empty area and paste the file there.  Answered in the affirmative if invited to replace the existing file.

  You can then start the Explorer in Task Manager by clicking file, new task (run...) and in the "Open:", enter:

  Explorer.exe

  Click OK to launch the Explorer and your office must return.

  Or after replacing the file missing or suspicious, just restart the system task manager by clicking on stop and choosing restart and then Explorer will start to him only when the system is restarted.

  If your computer to check your drive at every reboot, which means the "dirty bit" on the volume was probably settled and the only way to clear the dirty bit must run a chkdsk/r (which XP trying to do).   The dirty bit can be defined on a volume if there is a power interruption e.g. (plug pulling, using the power button / stop, etc.).

  Sometimes, XP can't erase the bit of impurity in this way and it is preferable to run chkdsk/r from the XP Recovery Console so you can actually see what he does and run it again if necessary.

  If you do not have any bootable media XP start in the XP Recovery Console, you can create a bootable XP (no XP media required) Recovery Console CD and do all your work from there.

  You can even replace the file browseui.dll from SP Recovery Console if it is your desire.

  Need instructions to create a CD of bootable XP Recovery Console?  No Microsoft Support Engineer seems to know how to do this, but I do and will instruct you in the next reply.

• Why do I get "mscms.dll is not a valid windows image" on everything I try?

  I'm working on the kinks of swap hard drive in my Dell E310. The original tested 'ready to die' so I installed a new. I bought the backup for XP Pro disk, when I bought the computer. I loaded the operating system on the new drive and did the updates (80 or almost). I regularly get the message "the file or dll C:\WINDOWS\system32\mscms.dll is not a valid windows image."  What now?

  I've damaged my file mscms.dll on purpose and could not get any message about it even though I know that it is corrupt - maybe I wasn't quite hard.   I know that some other mscms.dll errors, but they are different.

  Tell me what you're doing to regularly get the message because I'd like to see it.

  After reinstalling and apply the updates of 80 or more, one of them was Service Pack 3?

  If you are not sure which SP you re running, click Start, run, and in the type box:

  Msinfo32

  Click OK to see your system information and Service Pack and what does say?

  If the rest of your system works well, you can use Explorer to navigate to the c:\windows\system32 folder and rename your file to mscms.dll suspicious to a name, remember (like: mscms.bad).

  So if your Windows File Protection is not working properly, it will notice the missing file and quickly and quietly, to replace the missing file with a backup copy.

  Wait a few seconds... then press F5 in your Explorer window to refresh the view and see that the file has been replaced and you have the mscms.bad and a new copy of mscms.dll.

  You should see a message like this in your newspaper observer event system:

  Event type: Information
  Event source: Windows File Protection
  Event category: no
  Event ID: 64002
  Description:
  File replacement was attempted on the protected system file c:\windows\system32\mscms.dll. This file was restored to the original version to maintain system stability. The file version of the system file is 5.1.2600.5627.

  Restart and see how things look now.

  I can also send you a version SP2 or SP3 file mscms.dll via my SkyDrive and you can rename your suspicious file and replace to see if that helps your condition.  You might have some settings do not match here.

• The application or DLL c:/progna~1/windows~3/datamngr/datamngr.dll is not a valid windows image. Please check this against you instattation disk

  I am havin problems with my computer, when I start my computer or open a page or try to download anything it comes so far... The application or DLL c:/progna~1/windows~3/datamngr/datamngr.dll is not a valid windows image. Please check this against you instattation disk... I have a lot of problems in trying to solve how to fix this, as I don't know that much about computers. and I don't have the installation disc, I use windows xp I would be great if someone could help me please thank you. Kayleigh lindsay

  It also suggests that you can not run a software antivirus... If this is something you need to heal very quickly.  However, installing an antivirus application - if your PC is already infected - is usually ineffective.

  I suggest you do the following-
  (1) download and run a full scan using the Scanner for Ms.  Available here: http://www.microsoft.com/security/scanner/en-us/default.aspx
  It does not install, is therefore more difficult for malware to block.
  (2) if that was clean, then get an anti-virus in real-time as soon as POSSIBLE.  There are many good choices (Norton, McAfee, etc.) which costs money, and several good without applications, including MS Security Essentials available here: http://windows.microsoft.com/en-US/windows/products/security-essentials
  Note!  If you have another antivirus installed, do not add MSE.  Run two at once is precarious - they will conflict with each other.
  Also, make sure that your windows firewall is turned on, or you have another 3rd party firewall installed.

• Rstrui.exe - bad Image of the application or DLL C:\Windows\System32\Wbem\Framedyn.dll is not a valid windows image. AND the exe task manager. -Bad guess. The application or DLL C:\Windows\System32\VDMDBG. DLL is not a valid windows image.

  I use WIndows XP.  After that THINKPOINT is presented on my system, I have not been able to access my task manager or restore my system to an earlier date.

  I have checked Kellys Korner and various other suggestions on the internet, but have had no luck with anything.

  It shows that the HKEY value for the Task Manager is set to 0.  Don't know if that helps.

  I BELIEVE I have the THINK POINT removed from my system.  I use Microsoft Security, Ad-Ware and Malwarebytes Anti - Malware.  Between the 3, it seems I have everything.

  But now I can not restore my system, or use my TASK MANAGER.

  Help would be GREATLY appreciated.

  Thank you!

  Bindifer

  Think like a malicious software...
  It infects your system and is not to be found and removed.
  What are you most likely to use to find and remove malware?
  Internet, Google, Task Manager, regedit, restore the system command prompt, etc...
  The malware is often afflicts one or more of these components to try to trick into thinking you need to perform a system restore, a repair facility, or even to reinstall your XP from scratch.  None of these things are necessary since you can usually just to thwart malware.
  If the referenced files are completely absent from your system, you will see messages like this when you try to run the applications:
  Taskmgr.exe - Unable to locate component
  This application has failed to start because VDMDBG.dll is not found.  Reinstalling the application may fix this problem.
  Rstrui.exe - Unable to locate component
  This application has failed to start because framedyn.dll was not found.  Reinstalling the application may fix this problem.
  Sometimes you can click through the OK messages to access the System Restore screen, but the restoration of the system is still broken.
  If the referenced files are present on the system, but somehow corrupted, you will see messages like this when you try to run the applications:
  Taskmgr.exe - bad Image
  The application or DLL C:\WINDOWS\system32\VDMDBG.dll is not a valid Windows image.  Please check this against your installation diskette.
  Rstrui.exe - bad Image
  The application or DLL C:\WINDOWS\system32\wbem\framedyn.dll is not a valid Windows image.  Please check this against your installation diskette.
  Sometimes you can click through the OK messages to access the System Restore screen, but the restoration of the system is still broken.
  These files are part of the file 3498 who cares about Windows File Protection, so unless the WFP is also broken it is likely that files are missing completely (you get a different error message).  What is more likely is that the files are somehow corrupt or have been replaced by incorrect files.
  Assuming that XP is installed on your C drive and in the windows folder, XP keeps copies of 3498 files that he cares about this issue:
  c:\Windows\System32\dllcache
  On a health care system, Windows File Protection keeps track of 3498 protected files and quickly and quietly replaces all the files in the list that appears missing from the backup folder.  File protection Windows will not replace the files if they are somehow corrupted or replaced by bad files.
  You can simply copy the backup files in the dllcache folder in the folder where are the suspects or missing files.
  Using Explorer, navigate to the folder c:\windows\system32\dllcache and individually to copy the backup files in there and then navigate the folders where the suspect or incorrect files are and paste in the copied files.
  Depending on your installation, you can also find copies of the files in this folder:
  c:\windows\ServicePackFiles\i386
  Answer Yes, if you are prompted to replace existing files.
  Test your functions now and then to reboot your system to make sure the changes 'stick', and then fix any problems.

  Do, or do not. There is no test.

  I need YOUR voice and the points for helpful answers and propose responses. I'm saving for a pony!

• application or the C:\windows\system32\odbcint.dll dll is not a valid windows image

  Hi everyone, my fathers laptop crashed yesterday and since then he was able to start and the following message appears

  application or the C:\windows\system32\odbcint.dll dll is not a valid windows image

  something appears then it restarts. I did some occasional checking of this problem, as believe that he may be able to replace the file with its installation in recovery mode disc, although neither nor I did before can someone provide some support on what to do, ideally if we can get into windows and get the docs off the laptop computer he is happy the new facility because I think that it maybe Basic virus/malware issue.

  Thank you for your time and help in advance

  If the c:\windows\system32\odbcint.dll file is missing, you see a message like this:

  User Interface failure
  The logon User Interface DLL msgina.dll failed to load.
  Contact your system administrator to replace the DLL or restore the original DLL.

  There is a button to click to restart, which when clicked, takes a while to reboot the system.

  If the c:\windows\system32\odbcint.dll file is corrupted, you will see a message like this:

  Winlogon.exe - bad Image
  The application or DLL C:\WINDOWS\system32\odbcint.dll is not a valid Windows image.  Please check this against your installation diskette.

  By clicking OK twice, you will see the message above about the failure of User Interface.

  There will be events in the case where the viewing Application log that look like this:

  Event type: error
  Event source: ODBC
  Event category: no
  Event ID: 0
  Description:
  Cannot find the description for event ID (0) in Source (ODBC). The local computer may not have the information necessary registry or message DLL files to display messages from a remote computer. You may be able to use the option/auxsource = flag to retrieve this description; For more information, see Help and Support. The following information is part of the event: unable to load the resource DLL odbcint.dll.

  You should figure out what happened to get into this situation and respond to the following questions, then decide which is the best plan:

  Please provide additional information on your system:

  What is your system brand and model?

  What is your Version of XP and the Service Pack?

  Describe your current antivirus and software anti malware situation: McAfee, Symantec, Norton, Spybot, AVG, Avira!, MSE, Panda, Trend Micro, CA, Defender, ZoneAlarm, PC Tools, Comodo, etc..

  The afflicted system has a CD/DVD drive work?

  You have a true bootable XP installation CD (it is not the same as any recovery CD provided with your system)?

  Fill in the blank: my system worked well until: _.

  Did the problem to the top after show installed new software and if so, what software?

  You have recently installed any type of remote control software?

  Now to fix it depends on how you are fixed to the boot media, since you'll have to start on something.

  We know that XP likes to keep the backup copies of critical system files in this folder:

  c:\Windows\System32\dllcache

  Knowing this, start in Recovery Console XP using your genuine XP bootable installation CD or if you have a genuine XP bootable installation CD, you can make one (no XP media required).  If you don't know what type of bootable media, you, do a CD of bootable XP Recovery Console and do not forget.

  If Yes, you want and are not in possession of a genuine XP bootable installation CD or a CD from Recovery Console XP bootable, the instructions to create a bootable XP Recovery CD of Console can / will be provided before any questioning begins.

  You can replace the missing file or suspect the XP Recovery Console by entering the following command:

  Copy c:\windows\system32\dllcache\odbcint.dll c:\windows\system32

  Answered in the affirmative if invited to replace the existing file and then you should see a message that 1 file (s) has been copied.

  If you get some type of a file not found message, the file is easily replaced using other methods.

  Remove the CD and type "exit" at the Recovery Console prompt to restart the system.

  Do, or do not. There is no test.

  I decided to implement the points for a new puppy instead of a pony!

• I get a dll error message that says: "the application or DLL C:\WINDOWS\system32\kizinone.dll is not a valid Windows image. Please check this against your installation diskette.

  I get a dll error message that says: "the application or DLL C:\WINDOWS\system32\kizinone.dll is not a valid Windows image.  Please check this against your installation diskette.

  I went to the system registry to find the file it refers and is not a he.  I ran a norton registry cleanup and a virus scan.  I did find something online that made reference to this dll file.  The message appears at any time that I start a new program.  How to fix this, or find the virus that is the cause.

  A Google search for "[insert the name of the file]" grown up nothing. When you get no hits for a filename on Google, chances are high that it is a malicious program file. You did not when you get the message. If it's only at startup, either you have uninstalled the malware program or your antivirus/antispyware program did. In all cases, a reference has been left in the boot file. You can remove the reference by managing your startup. If you get the message during regular time on the computer and not not only at startup, your computer is still infected.

  Norton will do the job of cleaning and registry cleaners are garbage who at best will not do anything and the worst risk damage to your Windows installation.

  First of all, make sure that the computer is really free of virus/malware through these systematically - General malware removal steps http://www.elephantboycomputers.com/page2.html#Removing_Malware . Then, if the computer is really clean and you still receive the message, manage your Startup to remove the reference to the malware:

  Start > run > msconfig [Enter]

  This will open the System Configuration utility. Look under the Startup tab and find the likely culprit. Uncheck the box next to its name, apply and OK out. You don't need to restart immediately, but next time you do, you will get a dialog box saying that you have used the utility. Just check the box that says in effect, "don't mind to this subject again".

  How to troubleshoot by using the Msconfig in Windows XP utility - http://support.microsoft.com/?id=310560

  The free Autoruns program is very useful for managing your Startup - http://www.microsoft.com/technet/sysinternals/default.mspx
  MS - MVP - Elephant Boy computers - don't panic!

• "services.exe - bad image" and "the application or the DLL...\ShimEng.dll is not a valid Windows image.

  At the start this morning, I received the message following "services.exe - bad image" and "the application or the DLL...\ShimEng.dll is not a valid Windows image. Is there a simple solution to this problem? If it is ok, the unit freezes then

  Hello

  1. you remember to make changes to your computer, after which the issue started?

  I would recommend that you follow these steps and check if the problem persists.

  Step 1:

  I would recommend that you run a full scan using theMicrosoft Safety Scanner and check if the problem is related to malicious software.

  Note: You may lose data while eliminating malware.

  Step 2:

  Test the issue in a clean bootand verify if the issue.

  Note: Follow step 7 to your computer as usual.

  Step 3:

  Make SFC scan and check if the problem persists.

• Error - location: C:\Program Files\Common Program Files Central\Main\msvcr71.dll is not a valid windows image cannot access the desktop icon to burn a DVD.

  Original title: I can't access my desktop icon to burn a dvd.

  I can't access my desktop icon to burn a dvd.  The message I get is as follows, "location: C:\Program Files\Common Program Files Central\Main\msvcr71.dll is not a valid windows image."  Please check this against your installation diskette. "On my toolbar, it said,"mediahub.exe - bad image"can someone please help me as I've used in the past to burn CDs and DVDs.  He moved with the computer.  Thank you

  Hello

  1. have you done any hardware changes or software on your computer before this problem?

  2 do you have a copy of Sonic application backup to reinstall it later?

  I suggest you to uninstall Sonic since Add / Remove Programs. Subsequently, check if you are able to burn CDs in your computer.

  
  Reference: burn your own custom CDs

  Hope the helps of information.

• Error - the application or DLL is not a valid windows image. Please check this against your installation diskette when trying to open a program or start the computer.

  Original title: bad image.

  I get two errors of bad image whenever I open a program or start a computer, for each program.  the error that says "the application or DLL is not a valid windows image. "Please check this against your installation diskette" I don't have any disk and don't know what to do.

  These file names, look a little suspicious and didn't get good Google search results, so I think that the first thing to do is to tell us a little about your system.  Now you can enjoy when you report a problem, provide you with any error messages you see and not a part of it (not paraphrase either).

  The second thing to do is to try to be reasonably sure that your system is free of malware and then if you have these problems, you can fix them (which would be the third thing to do).

  I still wonder why the Microsoft Support Engineer made you reference to an article that makes no sense at all...

  The first thing to do:

  Unfortunately, MS Answers forums does not prompt for any information system when a new question is asked, so we don't know anything on your system.

  Because the Microsoft Answers forum does not ask for any type of information system when a new question is asked so we don't know anything about your system.  Not knowing the basic information a problem prolongs the frustration and the agony of these issues.

  Thank you MS Answers, allowing the resolution of simple problems as frustrating and a lot of time as possible.

  Provide information on your system, the better you can:

  What is your system brand and model?

  Your system have IDE or SATA disks?

  Describe your current antivirus and software anti malware situation: McAfee, Symantec, Norton, Spybot, AVG, Avira!, MSE, Panda, Trend Micro, CA, Defender, ZoneAlarm, PC Tools, Comodo, etc..

  The question was preceded by a loss of power, aborted reboot or abnormal termination?  (this includes the plug pulling, buttons power, remove the battery, etc.)

  The afflicted system has a working CD/DVD (internal or external) drive?

  You have a true bootable XP installation CD (it is not the same as any recovery CD provided with your system)?

  The second thing to do:

  Download, install, update and do a full scan with these free malware detection programs:
  Malwarebytes (MMFA): http://malwarebytes.org/
  SUPERAntiSpyware: (SAS): http://www.superantispyware.com/
  They can be uninstalled later if you wish.
  The third thing to do:

  Restart your computer and solve the outstanding issues.

• "The Application or DLL C:\Windows\System32\dwmapi.dll is not a valid Windows Image" Windows Live Mail - Error Message

  When you use Windows Live Mail, whenever I try to open an e-mail that I receive the following error message: the Application or DLL C:\Windows\System32\dwmapi.dll is not a valid Windows Image.  What can I do about it?

  View all Windows Live and Hotmail questions in the appropriate forum found here:
  http://windowslivehelp.com/

• Error "the application or DLL C;|WINDOWS\system32\NCObjAPI.DLL is not a valid Windows image. "Please check this against your installation diskette."

  Original title: lockout

  I get a black screen with the message from the application or DLL C;|WINDOWS\system32\NCObjAPI.DLL is not a valid Windows image. Please check this against your installation diskette.

  Hey Todd-Cindy-MorganBurris,

  1. Did you the latest changes on the computer?
  2. When was the last time it was working fine?
  3. You have security software installed on the computer?
  4. You are able to boot into Windows after the error message?

  Method 1

  If you are unable to boot into Windows then check if the problem persists in safe mode.

  A description of the options to start in Windows XP Mode

  http://support.Microsoft.com/kb/315222

  Method 2

  If the problem does not persist in safe mode, then it is possible that some third-party programs installed on the computer is causing the problem.

  I suggest that you put the computer in a clean boot state and check if it helps.

  To help resolve the error and other messages, you can start Windows XP by using a minimal set of drivers and startup programs. This type of boot is known as a "clean boot". A clean boot helps eliminate software conflicts.

  See section to learn more about how to clean boot.

  How to configure Windows XP to start in a "clean boot" State

  http://support.Microsoft.com/kb/310353

  Reset the computer to start as usual

  When you are finished troubleshooting, follow these steps to reset the computer to start as usual:

  (a) click Start, type msconfig in the search box and press ENTER.

  (b) If you are prompted for an administrator password or for confirmation, type your password or click on continue.

  (c) under the general tab, click the Normal startup option, and then click OK.

  (d) when you are prompted to restart the computer, click on restart.

  Method 3

  If you can boot into safe mode and clean boot procedure don't help then I would suggest that scan you SFC on the computer that will search the corrupted system files and check if that helps.

  The analysis may take some time, so be patient. Windows allows to fix corrupt or missing files it finds. If the information of the installation CD is required to fix the problem, you may be asked to insert your Windows XP installation CD.

  Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe)

  http://support.Microsoft.com/kb/310747

• Error at startup of Windows 'msseces.exe - bad image. the application or dll program files\ microsoft security client\ sqmapi.dll c:\ is not a valid windows image... »

  MSSECES. EXE

  My mini HP netbook 110-1000 has now two screens same when I start, I am running windows xp. When I boot I get a box that says msseces.exe - bad image, it says inside the box of the application or dll program files\ microsoft security client\ sqmapi.dll c:\ is not a valid windows image. Please check this against your installation diskette. the netbook came with a floppy disk. programs are in the partitioned hard disk. the other thing, I noticed that it's my icon for security essentials is missing and I can't uninstall security essentials because it crashes when I try to uninstall, and then he asks me if I want to report to microsoft. e help thank you Gary.

  Hi Gary,.

  It seems that Microsoft Security Essentials has corrupted on your computer. You can uninstall and reinstall the program to check the issue.

  Step 1: Since you are facing problems of removal of the program, you can check the following thread and check if it helps.

  Uninstallation of MSE - Microsoft Answers

  Step 2: To reinstall, refer to the following.

  Virus, spyware & Malware Protection | Microsoft Security Essentials

  See also:

  Checklist for installation of Microsoft Security Essentials - Microsoft Answers