Networking in Windows 7 problem

Similar Questions

• wireless network with windows vista problems

  My laptop has windows vista edition family service pack 1. It does not connect to my router thomson TG585 v7 gateway. Ive tried everything nothing helped. I've heard this may be a compatibility problem with windows vista and there may be an available for this patch. Is this correct and how I could get it?

  You have a power switch Wireless switch on your laptop?

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  Go to the website of the manufacturer of your router > make sure you have the latest Firmware in Vista for it.

  Go to the website of the manufacturer of your computer/notebook > drivers and downloads Section > key in your model number > look for it last network adapters Vista drivers > download/install the.

  http://Windows.Microsoft.com/en-us/Windows-Vista/troubleshoot-network-adapter-problems

  Troubleshoot network adapter problems to Microsoft link above.

  Try without commitment TCP/IPv6:

  If you still have internet connection probs, one thing to try is the separation of the TCP/IPv6 (which is done by going to network connection > right click > properties > it uncheck > OK.)

  http://digitalmediaphile.WordPress.com/IPv6-how-to-unbind-from-a-NIC-in-Windows-Vista/

  See you soon.

  Mick Murphy - Microsoft partner

• Original title: the connection card wireless network with windows 7 problem

  I have a dv6 Notebook PC HP clubhouse, 64-bit Windows 7 Home Premium, I bought end July2010. H-he detects the wireless network but will not connect. just if I'm until modem.but colse it smt connect to the deffernt wireless network. What is happening and where do I go to fix this problem.

  Hello

  1 have had any changes made on the computer before the show?

  2. do you get an error message when you try to connect to the wireless network connection?

  Method 1:

  First of all, I suggest for the link and try to run the troubleshooter and check if it helps.

  Windows wireless and wired network connection problems

  http://Windows.Microsoft.com/en-us/Windows/help/wired-and-wireless-network-connection-problems-in-Windows

  Method 2:

  I suggest you to refer to the article and see if it helps:

  How can I troubleshoot network card?

  http://Windows.Microsoft.com/en-us/Windows7/how-do-I-fix-network-adapter-problems

  Let us know if you need more assistance.

• Diagnostics Windows network, the error reads 'Problem with wireless adapter or access point' and fails to solve the problem.

  «Problem with access point or wireless adapter»

  Hi, I just bought a new laptop & I have the extreme difficulty to stay connected to the internet. When I run Windows Network Diagnostics, error reads 'Problem with wireless adapter or access point' and fails to solve the problem. Help, please... Thank you, Maria

  HI Maria,

  ·         What operating system is installed on your computer?

  ·         You have installed the latest drivers for wireless network card?

  Follow the suggestions below for a possible solution:

  Method 1: Start your computer in a clean boot state in order to check if the applications of third parties or startup items is the origin of the problem.

  How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

  http://support.Microsoft.com/kb/929135

   

  Note: After troubleshooting, make sure that you configure the computer to start as usual as mentioned in step 7 in the above article.

  Method 2: See these articles for solve wireless problems:

  Why can't I connect to the Internet?

  http://Windows.Microsoft.com/en-us/Windows7/why-can-t-I-connect-to-the-Internet

   

  How can I troubleshoot network card?

  http://Windows.Microsoft.com/en-us/Windows7/fix-network-adapter-problems

   

  Windows wireless and wired network connection problems

  http://Windows.Microsoft.com/en-us/Windows/help/wired-and-wireless-network-connection-problems-in-Windows

  Let us know if that helps.

• Network authentication and identification problem of loop on Windows 7

  I am on Window 7 Home Premium, when I use my laptop and try to connect to the network at my workplace, it pop up the authentication of network call screen and ask me to put the username and password (I log in my laptop as administration) before typing the security code. Even when I manually add the profile of the network, I be able to connect to the network, but she just keep living to identify loop and I cannot go online. Someone at - it had the solution for these problems? Thank you very much

  Hello Daniel,.

  Thanks for posting your question on the Microsoft community.

  I would like to know some information about the problem so that we can help you better.

  Your computer is connected to a domain network?

  Thank you for details on the question and your efforts to resolve.

  This problem can occur for the following reasons:

  -Network standards do not match.
  -Missing updates.
  -Incorrect network connection settings.
  -Damaged or incompatible drivers.

  I would suggest trying the following methods and check if it helps.

  Method 1:
  Run the network troubleshooting and check.
  Reference:
  Using the troubleshooter from network in Windows 7
  http://Windows.Microsoft.com/en-us/Windows7/using-the-network-troubleshooter-in-Windows-7

  If this does not help, use method 2:

  Method 2:
  Please use the suggestions in this article and check the issue.
  Reference:
  Why can't connect me to a network?
  http://Windows.Microsoft.com/en-us/Windows/cant-connect-to-network#1TC=Windows-7

  I hope this information helps.

  Please let us know if you need more help.

  Thank you

• Problem of not seeing list drop-down connection to the wireless network when checking connections network - pc windows 7.

  Problem of not seeing list drop-down connection to the wireless network when checking connections network - pc windows 7.

  I just installed a Belkin modem-router - which went well. Can I connect WiFi gadgets etc. I can also connect to the internet via a network cable to my pc. I also installed a belkin usb wireless adapter and in Device Manager, says it is enabled and works.

  My problem is, I have no way of choice get a WiFi PC to display in the list (from the notification area) and cannot get the pc to give me options to create a wi - fi connection. The more I get to try to do that is "unexpected error"!

  If someone could help on this - I would be very grateful

  Good news - update of my ongoing saga with this Belkin modem/router.

  Got the pc to see wi - fi now. It turned out to be the Zone Alarm! As the router has a firewall, I uninstalled Zone Alarm completely. Also, I went into the properties of belkin usb and checked it was the most recent drivers, it does not so I installed them.

  So far so good

  Thanks for the help

  TREV Smith

• Windows 8 problem with wireless network adapter

  I had a lot of trouble to stay connected to the internet with my college wireless network on

  my laptop Windows 8. Especially when my computer is endearing to load a large number of data, the connection becomes limited and stops working. I use the resolution of problems and there's always the wireless adapter, which always solve the problem. This problem will not occur on the unsecured network comments from school or home. I tried many solutions to solve the problem, as going to tab the wireless one adapter power management uncheck allow the computer to turn off this device to save power. nothing has worked so far. Here are the details of the detection of the troubleshooter from the last time that this problem occurred:

  Details about network adapter diagnosis: Network adapter Wi-Fi driver information: Description . . . . . . . . . . : Dell Wireless 1704 802.11b/g/n (2.4GHz) Manufacturer . . . . . . . . . : Broadcom Provider . . . . . . . . . . . : Broadcom Version . . . . . . . . . . . : 6.30.59.74 Inf File Name . . . . . . . . . : C:\WINDOWS\INF\oem51.inf Inf File Date . . . . . . . . . : Monday, September 17, 2012 6:52:18 PM Section Name . . . . . . . . . : BCM1704HMD_NT62 Hardware ID . . . . . . . . . . : pci\ven_14e4&dev_4365&subsys_00161028 Instance Status Flags . . . . . : 0x180200a Device Manager Status Code . . : 0 IfType . . . . . . . . . . . . : 71 Physical Media Type . . . . . . : 9

  Diagnostic information (wireless connectivity)

  Details about wireless connectivity diagnosis: Information for connection being diagnosed Interface GUID: 81887e6c-9ddc-413d-be6a-4465ad36cf87 Interface name: Dell Wireless 1704 802.11b/g/n (2.4GHz) Interface type: Native WiFi Connection incident diagnosed Auto Configuration ID: 1 Connection ID: 1 Connection status summary Connection started at: 2015-03-08 14:48:33-522 Profile match: Success Pre-Association: Success Association: Success Security and Authentication: Success List of visible access point(s): 7 item(s) total, 7 item(s) displayed BSSID BSS Type PHY Signal(dB) Chnl/freq SSID ------------------------------------------------------------------------- 28-8A-1C-FE-CA-80 Infra -91 1 smcm-guest 28-8A-1C-FE-0D-80 Infra -50 1 smcm-guest 28-8A-1C-FE-0D-82 Infra -54 1 resnet 28-8A-1C-FE-B5-C0 Infra -48 6 smcm-guest 28-8A-1C-FE-B5-C2 Infra -47 6 resnet 28-8A-1C-FE-3F-40 Infra -91 6 smcm-guest 28-8A-1C-FE-3F-42 Infra -88 6 resnet Connection History Information for Auto Configuration ID 1 List of visible networks: 2 item(s) total, 2 item(s) displayed BSS Type PHY Security Signal(RSSI) Compatible SSID ------------------------------------------------------------------------------ Infra No 87 Yes smcm-guest Infra Yes 87 Yes resnet List of preferred networks: 5 item(s) Profile: mobilenet SSID: mobilenet SSID length: 9 Connection mode: Infra Security: No Set by group policy: No Connect even if network is not broadcasting: No Connectable: No Reason: 0x00028003 Profile: NETGEAR30 SSID: NETGEAR30 SSID length: 9 Connection mode: Infra Security: Yes Set by group policy: No Connect even if network is not broadcasting: No Connectable: No Reason: 0x00028003 Profile: Yeager Network SSID: Yeager Network SSID length: 14 Connection mode: Infra Security: Yes Set by group policy: No Connect even if network is not broadcasting: No Connectable: No Reason: 0x00028003 Profile: resnet SSID: resnet SSID length: 6 Connection mode: Infra Security: Yes Set by group policy: No Connect even if network is not broadcasting: No Connectable: Yes Profile: smcm-guest SSID: smcm-guest SSID length: 10 Connection mode: Infra Security: No Set by group policy: No Connect even if network is not broadcasting: No Connectable: No Reason: 0x00028001 Information for Connection ID 1 Connection started at: 2015-03-08 14:48:33-522 Auto Configuration ID: 1 Profile: resnet SSID: resnet SSID length: 6 Connection mode: Infra Security: Yes Pre-Association and Association Connectivity settings provided by hardware manufacturer (IHV): No Security settings provided by hardware manufacturer (IHV): No Profile matches network requirements: Success Pre-association status: Success Association status: Success Last AP: 28-8a-1c-fe-b5-c2 Security and Authentication Configured security type: WPA2-802.1X Configured encryption type: CCMP(AES) 802.1X protocol: Yes Authentication mode: User only EAP type: Authentication not started Number of 802.1X restarts: 0 Number of 802.1X failures: 0 802.1X status: Success Key exchange initiated: Yes Unicast key received: Yes Multicast key received: Yes Number of security packets received: 13 Number of security packets sent: 13 Security attempt status: Success Connectivity Packet statistics Ndis Rx: 400791 Ndis Tx: 204956 Unicast decrypt success: 0 Multicast decrypt success: 0 Unicast decrypt failure: 0 Multicast decrypt failure: 0 Rx success: 1632 Rx failure: 846 Tx success: 240 Tx failure: 0 Tx retry: 24 Tx multiple retry: 12 Tx max lifetime exceeded: 0 Tx ACK failure: 60 Roaming history: 0 item(s)

  Diagnostic information (wireless connectivity)

  Details about wireless connectivity diagnosis: For complete information about this session see the wireless connectivity information event. Helper Class: Auto Configuration Initialize status: Success Information for connection being diagnosed Interface GUID: 81887e6c-9ddc-413d-be6a-4465ad36cf87 Interface name: Dell Wireless 1704 802.11b/g/n (2.4GHz) Interface type: Native WiFi Result of diagnosis: There may be problem

  Diagnostic information (wireless network adapter)

  Details about wireless network adapter diagnosis: For complete information about this session see the wireless connectivity information event. Helper Class: Native WiFi MSM Initialize status: Success Information for connection being diagnosed Interface GUID: 81887e6c-9ddc-413d-be6a-4465ad36cf87 Interface name: Dell Wireless 1704 802.11b/g/n (2.4GHz) Interface type: Native WiFi Profile: resnet SSID: resnet SSID length: 6 Connection mode: Infra Security: Yes Connect even if network is not broadcasting: Yes Result of diagnosis: There may be problem

  Thanks for any help! It happened for about eight months and it's really frustrating.

  Hello

  Check with Dell and Broadcom, their documentation diagnostics online and drivers.
  and ask questions in the forums about known problems. The two Dell driver update, then
  Broadcom if there is more recent.

  Dell support
  http://support.Dell.com/

  Dell support drivers - product manual & warranty Info (left side) - and much more
  http://support.Dell.com/support/index.aspx?c=us&l=en&s=DHS

  Dell forums
  http://en.community.Dell.com/forums/

  Dell PC Diagnostics
  http://www.Dell.com/support/Diagnostics/us/en/19/
  Broadcom - downloads and Customer Support
  http://www.Broadcom.com/support/

  ==============================

  More troubleshooting:

  It is possible that the drivers you use, even if later now available, are not
  100% Windows compatible 8.1. Check with the manufacturer of your system (motherboard support
  Manufacturer of custom systems) and/or the manufacturer of the device. This one, like Intel,
  RealTek, Atheros and others may have newer versions is not available to the mother of system
  -site of the manufacturer on board. And continue to check in with them regularly over the next year.
  Also update the BIOS, drivers from the chipset of low level and major embedded and separate
  device drivers.

  Download your applications and devices in Windows 8.1
  http://Windows.Microsoft.com/en-in/Windows-8/get-apps-devices-working

  =========================================================

  Don't forget to check the updates of the firmware on the router, because who can have a definite effect
  on connections Windows 8.1 same if other OS systems connections are fine.

  Check with support of the manufacturer of the system (motherboard for customized systems manufacturer) and/or
  the manufacturer of real device driver updates. If there is no newer versions re - install the same
  ones. Ask known in their forums (if any) problems.

  ===================================

  General resolution: (after the above if necessary)

  Free Wi - Fi and wireless problems
  http://Windows.Microsoft.com/en-us/Windows/network-connection-problem-help#network-problems=Windows-8&V1H=win8tab1&V2H=win7tab1&V3H=winvistatab1&v4h=winxptab1

  Note the use of Win Key + X and Win Key + W (to access control panel, run,
  and settings according to needs). Win + D key calls to the office and use
  Win Key activates / deactivates the desktop and start screen.

  --------------------------------------------------------------

  Control Panel - Network and sharing Center - solve problems

  References to Vista also apply to Windows 7 and Windows 8.
  
  Your router be guess here, you have successfully updated the firmware a possible
  solution? And I would update your WiFi drivers on computers. How far away are they
  you have set in the router? Are there obstacles in the path?

  Actually try updating your driver and disabling the network logon.

  Control Panel - network - write down of the brand and the model of the Wifi - double click
  top - tab of the driver - write version - click on update driver (can't do
  nothing that MS is far behind the certification of drivers). Then right click on the Wifi
  Device and UNINSTALL - Reboot - it will refresh the driver stack.

  Look at the sites of the manufacturer for drivers - and the manufacturer of the device manually.
  http://pcsupport.about.com/od/driverssupport/HT/driverdlmfgr.htm

  Download - SAVE - go where you put it - right click – RUN AS ADMIN.

  You can download several at once however restart after the installation of each of them.

  After watching the system Maker you can see the same device manufacturer
  more recent versions. (Those become your fonts of rescue system manufacturer).

  Repeat for network (NIC) card and is a good time to get the other update
  Drivers Windows 8 like updated drivers.

  The adapter in Microsoft Windows 8/8.1 network problems - how to fix? (Do not forget to see
  This section-> update the NIC driver).
  http://Windows.Microsoft.com/en-us/Windows-8/fix-network-adapter-problems

  Drivers and Microsoft - Windows 8/8.1 - material
  http://Windows.Microsoft.com/en-us/Windows/hardware-drivers-help#hardware-drivers-help=Windows-8

  Microsoft Windows 8/8.1 - Why Windows is not find my device?
  http://Windows.Microsoft.com/en-us/Windows-8/why-isn ' t-windows-conclusion-device

  Microsoft Windows 8/8.1 - what happens if a device is not installed correctly
  http://Windows.Microsoft.com/en-us/Windows-8/what-device-isn ' t-installed-correctly
  ------------------------------------------------------

  Make sure you know the details of connection to your wireless router - SSID and password.

  You lose connection when you do and have to redo your logon.

  Control Panel - Network & Sharing Center - set up a new connection or network

  -----------------------------------------------------

  And:

  TechingItEasy - how to join a Wi - Fi network in Windows 8 by MVP Andre Da Costa
  http://techingiteasy.WordPress.com/2012/06/09/how-to-join-a-Wi-Fi-network-in-Windows-8/

  Microsoft - Windows 8/8.1 - Web & Networking
  http://Windows.Microsoft.com/en-us/Windows/Web-networking-help#V1H=win8tab1&V2H=win7tab1&V3H=winvistatab1&v4h=winxptab1&Web-networking-help=Windows-8

  Microsoft - Windows 8/8.1 - Wi - Fi & Networking
  http://Windows.Microsoft.com/en-us/Windows-8/WiFi-networking#1TC=T1

  -----------------------------------------------------

  Microsoft - Windows 7 - Why is my Internet connection so slow? (applies to Windows 8)
  http://Windows.Microsoft.com/en-us/Windows7/why-is-my-Internet-connection-so-slow

  Microsoft - Windows 8/8.1 - wired and wireless in Windows problems
  http://Windows.Microsoft.com/en-us/Windows/network-connection-problem-help#network-problems=Windows-8&V1H=win8tab1&V2H=win7tab1&V3H=winvistatab1&v4h=winxptab1

  I hope this helps.

  Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

• Windows 7 - problem 'says that my laptop was inconsistent.

  Original title: Windows 7 problem.

  At this moment, I have problems with Microsoft. A message to see if my laptop was ready for Windows 7. When I tried another message came to say that my laptop was inconsistent and that I should check my internet and try again later. My internet is OK. Please help me, I'm missing out on a lot.

  Hello

  Start the computer in safe mode with network, run Windows 7 Upgrade Advisor and check the status of the issue.

  To start the computer in safe mode with network.

  http://www.Microsoft.com/resources/documentation/Windows/XP/all/proddocs/en-us/boot_failsafe.mspx?mfr=true

  Please let us know if you need more assistance.

• I run a network of Windows 2008 Server r2 with a storage unit attached to the network that we put on our shared files.

  I run a network of Windows 2008 Server r2 with a storage unit attached to the network that we put on our shared files.

  I can access the shared files of most of my computers on the domain, but there are a few that have WINXP Pro can't do. Some of the XP computers can access it, but the only people who can't are XP. I think it might be something with the local security settings, but I'm not sure. The error I get is: \\server name \sharing folder is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have permissions.  The request is not supported.   All users have permissions and can view the files from other computers just these few who have been able to do actions. Any help would be useful.
  The procedure below: the problem: give perminiant solution pls
  1. delete the field and add the domain
  2 delete the user profile, and create user profile.
  Error:
  An error occurred during connection network Y:to\\server\common Microsoft windows folder: the local device name is already in use. This connection has not been rerun.

  Hello

  I suggest you according to the question in this forum and check if that helps:

  http://social.technet.Microsoft.com/forums/en-us/winservergen/threads

  It will be useful.

• The tab network on Windows media player does not open

  I can't open the network on Windows media player 11 despite uninstall and reinstall twice. I even brought back to WMP 10 and even on the network tab would not open. any ideas, anyone please?

  Hi Mooby00,

  1. what happens when you try to access the network tab?

  2. you receive an error message?

  3 when was the last time it was working fine?

  I suggest that restore you to the basic version of Windows media player in Windows XP, which is version 9 and check if the problem persists.

  I hope this helps!

  Halima S - Microsoft technical support.

  Visit our Microsoft answers feedback Forum and let us know what you think.

• launch of checkers problems: error: trying to re-launch your game. If the problem persists, it may be network with the server problems or a problem with the configuration of your firewall.

  Windows Vista can not launch problem of checkers: try to re-launch your game. If the problem persists, it may be network with the server problems or a problem with the configuration of your firewall. Please check your firewall settings by visiting the Open Ports FAQ.

  Original title: launch of the problems of checkers:

  Hello

  If you have not yet tried to disable the antivirus/firewall software, then try the following steps to disable them.

  Disable the anti-virus software: http://windows.microsoft.com/en-US/windows-vista/Disable-antivirus-software

  Enable or disable Windows Firewall: http://windows.microsoft.com/en-US/windows-vista/Turn-Windows-Firewall-on-or-off

  IMPORTANT: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do not disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network during the time that your antivirus software is disabled, your computer is vulnerable to attacks

• Cannot identify the network under Windows Vista

  I have windows vista SP2 and cannot connect to internet.  I see networks, but the computer is not able to identify.  I tried with several different networks, and the result is the same.

  Hi ClarkHayes,

  1. What is the error exact message you when you try to connect?

  I suggest you try the steps from the following link and see if that helps.

  In the Windows wireless network connection problems
  http://Windows.Microsoft.com/en-in/Windows/help/wireless-network-connection-problems-in-Windows?T1=tab04

  Solve problems, find wireless networks
  http://Windows.Microsoft.com/en-in/Windows-Vista/troubleshoot-problems-finding-wireless-networks

• Networking in windows vista and windows 7

  I have network problems the two operating systems.  I am able to see the systems of the other and visa versa, and all the share permissions have been turned on. I can't access the contents of the other system, nor can I access the printer on my desk.

  What I'm missing or doing wrong?

  Fredrich Becker-(COMPTIA Security + 2008)

  I don't know what is wrong because I don't know what you were doing.

  Here are the procedures for Vista with Windows7 network layout that can help: http://www.windowsnetworking.com/articles_tutorials/Windows-7-Understanding-Network-Administration-Configuration.html.

  Here is another article on home networks (with several links to related articles which must all be considered - as well as others, you will find in the related articles) to help you better understand the home networks:http://windows.microsoft.com/en-US/windows-vista/Setting-up-a-home-network.  If it's for Vista, much of it applies to Windows7 (although there may be some differences that should be addressed in the previous article).

  Here is an article on the networking of the different versions of Windows: http://windows.microsoft.com/en-us/windows7/Networking-home-computers-running-different-versions-of-Windows.

  I hope this helps. If necessary, start from scratch using these procedures and see if that helps.

  Good luck!

  Lorien - MCSA/MCSE/network + / has + - if this post solves your problem, please click the 'Mark as answer' or 'Useful' button at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

• Trying to set up a network with windows 7 Home premium

  I'm trying to set up a network on windows 7 Home premium, but could not find this secpol.msc. I read the posts on the guy with vista home premium and similar problems. I tried the advice given to him:

  Open regedit and locate the key:
  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Contrl\Lsa\LmCompatibilityLevel

  Set this value to 1 (is default on 3) "send LM and NTLM".
  See the Q823659 knowledge base 
  

  I got in the case of the LSA and found no LmCompatibiltyLevel, he was not in the file or it contained a folder with that name.

  I also read a post from someone about windows 7 as follows:

  On Windows 7 Home Premium, secpol.msc or this registry key is set.

  However if you add a new key named LmCompatibilityLevel DWORD value at the specified location and the value of '1' it seems to work to allow
  "Use NTLMv2 session security if negotiated".

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\LmCompatibilityLevel

  But my problem I do not know what he meant by 'DWORD '.

  If someone could help with this problem, it would be great.

  http://social.answers.Microsoft.com/forums/en-us/w7network/threads

  Connect to the Internet, a host group and e-mail.

  For any question on Windows 7:

  http://social.answers.Microsoft.com/forums/en-us/category/Windows7

  Link above is Windows 7 Forum for questions on Windows 7.

  Windows 7 questions should be directed to the it.

  You are in the Vista Forums.

  See you soon.

  Mick Murphy - Microsoft partner

• Cannot add new wireless networks in Windows 7

  I have an Asus laptop with a Realtek wireless card. Updates of drivers and windows are the latest versions. I can't add any new wireless connection. There is a list of the available connections but when I try to connect, nothing happens. I can connect to the old wifi networks without problem, but I have moved and have a new connection that I can not add, even when I try to do it manually with the network and sharing Center. It is not fair to this network, I could not connect when I was traveling either. I uninstalled and everything re-installed twice no longer useful. Help!

  HI Margaret,.

  Please contact the Microsoft community.

  1. you are getting error messages?
  2. What is the number of the model of the computer?
  3. have you made changes on the computer before this problem?

   
  Method 1:

  Using the troubleshooter from network in Windows 7

  http://Windows.Microsoft.com/en-us/Windows7/using-the-network-troubleshooter-in-Windows-7

  Method 2:

  I suggest you to go through the steps mentioned in the link and the Coachman.

  Windows wireless and wired network connection problems

  http://Windows.Microsoft.com/en-us/Windows/help/wired-and-wireless-network-connection-problems-in-Windows

  For more information, you can check the link below:
  

  http://Windows.Microsoft.com/en-us/Windows7/set-up-a-security-key-for-a-wireless-network

  Wireless network card: frequently asked questions

  http://Windows.Microsoft.com/en-us/Windows7/wireless-networking-frequently-asked-questions

  Keep us updated on the status of the issue persists. We will be happy to help you.