How do I reset Windows Update components?

Windows 8 and Windows 7

Run the Windows Update automated troubleshooter.

Windows Vista and Windows XP

The Automatically diagnose and fix common problems with Windows Update troubleshooter may automatically fix the problem described in this article.
This troubleshooter fixes many problems.learn more

(http://support.microsoft.com/mats/windows_update/)

run now

(http://go.microsoft.com/?linkid=9767096&entrypointid=MATSKB)

Note If you would rather fix this problem yourself, go to the "Let me fix it myself" section.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
To reset the Windows Update components, follow these steps

1. Open a Windows Command Prompt Windows. To open a command prompt, click Start and then click Run. Copy and paste (or type) the following command in the Open box and then press ENTER:
   
   cmd
2. Stop the BITS service and the Windows Update service. To do this, type the following commands at a command prompt. Press ENTER after you type each command.
   • net stop bits
   • net stop wuauserv
3. Delete the qmgr*.dat files. To do this, type the following command at a command prompt, and then press ENTER:
   Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat"
4. If this is your first attempt at resolving your Windows Update issues by using the steps in this article, go to step 5 without carrying out step 4. Step 4 should only be performed at this point in the troubleshooting if you cannot resolve your Windows Update issues after following all steps but step 4. The steps in step 4 are also performed by the "Aggressive" mode of the Fix it Solution above:
   1. Rename the following folders to *.BAK:
      • %systemroot%\SoftwareDistribution\DataStore
      • %systemroot%\SoftwareDistribution\Download
      • %systemroot%\system32\catroot2
      To do this, type the following commands at a command prompt. Press ENTER after you type each command.
      • Ren %systemroot%\SoftwareDistribution\DataStore *.bak
      • Ren %systemroot%\SoftwareDistribution\Download *.bak
      • Ren %systemroot%\system32\catroot2 *.bak
   2. Reset the BITS service and the Windows Update service to the default security descriptor. To do this, type the following commands at a command prompt. Press ENTER after you type each command.
      • sc.exe sdset bits D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)
      • sc.exe sdset wuauserv D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)
5. Type the following command at a command prompt, and then press ENTER:
   cd /d %windir%\system32
6. Reregister the BITS files and the Windows Update files. To do this, type the following commands at a command prompt. Press ENTER after you type each command.
   • regsvr32.exe atl.dll
   • regsvr32.exe urlmon.dll
   • regsvr32.exe mshtml.dll
   • regsvr32.exe shdocvw.dll
   • regsvr32.exe browseui.dll
   • regsvr32.exe jscript.dll
   • regsvr32.exe vbscript.dll
   • regsvr32.exe scrrun.dll
   • regsvr32.exe msxml.dll
   • regsvr32.exe msxml3.dll
   • regsvr32.exe msxml6.dll
   • regsvr32.exe actxprxy.dll
   • regsvr32.exe softpub.dll
   • regsvr32.exe wintrust.dll
   • regsvr32.exe dssenh.dll
   • regsvr32.exe rsaenh.dll
   • regsvr32.exe gpkcsp.dll
   • regsvr32.exe sccbase.dll
   • regsvr32.exe slbcsp.dll
   • regsvr32.exe cryptdlg.dll
   • regsvr32.exe oleaut32.dll
   • regsvr32.exe ole32.dll
   • regsvr32.exe shell32.dll
   • regsvr32.exe initpki.dll
   • regsvr32.exe wuapi.dll
   • regsvr32.exe wuaueng.dll
   • regsvr32.exe wuaueng1.dll
   • regsvr32.exe wucltui.dll
   • regsvr32.exe wups.dll
   • regsvr32.exe wups2.dll
   • regsvr32.exe wuweb.dll
   • regsvr32.exe qmgr.dll
   • regsvr32.exe qmgrprxy.dll
   • regsvr32.exe wucltux.dll
   • regsvr32.exe muweb.dll
   • regsvr32.exe wuwebv.dll
7. Reset Winsock. To do this, type the following command at a command prompt, and then press ENTER:
   netsh winsock reset
8. If you are running Windows XP or Windows Server 2003, you have to configure the proxy settings. To do this, type the following command at a command prompt, and then press ENTER:
   proxycfg.exe -d
   
   
   If you are running Windows 8, Windows 7, or Windows Vista, type the following command at a command prompt, and then press ENTER:
   
   netsh winhttp reset proxy
9. Restart the BITS service and the Windows Update service. To do this, type the following commands at a command prompt. Press ENTER after you type each command.
   • net start bits
   • net start wuauserv
10. If you are running Windows Vista or Windows Server 2008, clear the BITS queue. To do this, type the following command at a command prompt, and then press ENTER:
    bitsadmin.exe /reset /allusers
11. Install the latest Windows Update Agent. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
    949104

    (http://support.microsoft.com/kb/949104/ )

    How to obtain the latest version of the Windows Update Agent to help manage updates on a computer
12. Restart the computer.

Check whether the Windows Update components are reset. If the Windows Update components are reset, you are finished with this article. If the Windows Update components are not reset, you can contact support.

You may have other issues with Windows Update, visit the following Microsoft Website: If the information in this article did not help, select one of the following references:

• Help from the Microsoft Community online community
  Visit the Answers community and post your product activation question.
  (http://answers.microsoft.com/en-us/windows/forum/windows_update)
• Contact Microsoft support
  Find the phone number to contact Microsoft Support.
  (http://support.microsoft.com/contactus/)
• More online articles about Microsoft products
  Perform a search to find more online articles about activation.
  (http://support.microsoft.com/search/)