Article ID: 931849
Article Last Modified on 2/22/2007
APPLIES TO
- Windows Defender
SYMPTOMS
When you run Microsoft Windows Defender, you receive one of the following error messages:
CAUSE
This problem may occur when Windows Defender is updated.
RESOLUTION
To resolve this problem, follow these steps:
- Uninstall Windows Defender, and then reinstall Windows Defender. To do this, follow these steps:
- Click Start, click Run, type appwiz.cpl, and then click OK.
- Click Windows Defender, and then click Remove.
- Follow the prompts to uninstall Windows Defender.
- To reinstall Windows Defender, visit the following Microsoft Web site:
- If this issue is not resolved after you complete step 1, uninstall Windows Defender, use the Windows Installer CleanUp utility, and then reinstall Windows Defender. To do this, follow these steps:
- Click Start, click Run, type appwiz.cpl, and then click OK.
- Click Windows Defender, and then click Remove.
- Follow the prompts to uninstall Windows Defender.
- To use the Windows Installer CleanUp utility, click the following article number to view the article in the Microsoft Knowledge Base:
290301 Description of the Windows Installer CleanUp utility
- To reinstall Windows Defender, visit the following Microsoft Web site:
- If this issue is not resolved after you complete step 2, follow this step:
- Click Start, click Run, type regsvr32
file name
, and then click OK.
Note In this step,file name
is a placeholder for the following files.
Repeat this procedure for the following files:- wuapi.dll
- wuaueng.dll
- wucltui.dll
- wups.dll
- wuweb.dll
- atl.dll
- softpub.dll
- wintrust.dll
- initpki.dll
- mssip32.dll
- Click Start, click Run, type regsvr32
Additional query words: errmsg
Keywords: kbtshoot kbexpertisebeginner kberrmsg kbprb KB931849