MSConfig.exe - Unable to locate component... This application has failed to start because MFC42u.dll not found. Reinstalling the application may fix this problem.

I use XP.

When I try to solve the problem by running sfs/scannow I get the message:

"Files required for windows runs correctly must be copied into the DLL cache... Insert you windows XP Professional service pack 3 cd now.

My machine came with XP was preinstalled on the D: drive.  I did the HP recovery disk when I got the machine, but these discs do not work for this and I can't seem to redirect the scan to look for on the disk "D" assuming that it is the right thing to do.

I ran windows one care and he says I have 150 errors, that it cannot correct.  Until these problems started, it never reported more than one error could not resolve.

David Y has the correct syntax to decompress the file.  You have already the program 'develop' on your system.

The files that you see in i386 with underscore as the last character are compressed files (to save space). This type of compression is not the same when you say XP to compress a file.

Sometimes it is useful to understand that you can unzip these files there is you need if you come across one that is missing or suspect some time later.   Browse this folder and you will see a large number of files compressed, where the last character is an underscore character.

Remember - sfc/scannow will not replace the missing files and it won't replace not a file may have been overwritten by another program, but you can always develop a new copy if you need to.

Just make sure to type the commands to make it work.

I have my XP Service Pack 3 copied my E drive installation CD in a folder called E:\xp_source, and when I expanded my mfc42u.dl_ file I got a result like this:

C:\>expand e:\xp_source\i386\mfc42u.dl_ c:\windows\system32\mfc42u.dll

Microsoft (R) file expansion utility Version 5.1.2600.0

Copyright (C) Microsoft Corp 1990-1999.  All rights reserved.

Expansion of e:\xp_source\i386\mfc42u.dl_ to c:\windows\system32\mfc42u.dll .

e:\xp_source\i386\mfc42u.dl_: bytes 378327 extended to 981760 bytes, 159% increase.

The new expanded file will not have the time now to this topic, so don't expect to see that - just check that the missing file is present.

There should be some unnatural effort to actually remove one of 3498 XP as your protected files.  If you rename or delete just one of these files, Windows File Protection will be quickly and quietly replace it unless the Windows File Protection is also broken, so you can figure out how your file became missing in the first place.

If manually, you delete or rename a file monitored system, you will see an event like this in the Event Viewer system log when the Windows File Protection replaces:

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\mfc42u.dll. This file was restored to the original version to maintain system stability. The file version of the system file is 4.1.0.6151.

I would suspect some quarantied app antivirus or anti-malware (actually deleted) your file for you and that would be a problem.

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

What you use, you can follow up with these:

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 scans by operating clean, then to solve 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!

Tags: Windows

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