Microsoft KB Archive/817753

= Errors Occur When You Try to Install Updates from the Windows Update Web Site =

PSS ID Number: 817753

Article Last Modified on 4/17/2003

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The information in this article applies to:


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
When you use the Windows Update Web site to install updates, you may receive a 643 error message or a message indicating that Windows Update was unable to complete the operation.

Microsoft Windows Media Player may also be slow to respond.

Additionally, the %WINDIR%\system32\CatRoot2\Edb.log may grow to up to 20 megabytes (MB) even though the file is typically only 5,120 kilobytes (KB).



CAUSE
This issue may occur if the catalog database (Edb.log) is damaged. The catalog database is referenced by Windows Update and Windows Media Player. If the catalog database is damaged, the update may not install correctly, and you may experience the behavior described in the &quot;Symptoms&quot; section of this article.



WORKAROUND
To work around this issue, follow these steps:  Click Start, click Run, type cmd, and then click OK. At the command prompt, type the following command, and then press ENTER:

del /q &quot;%SystemRoot%\System32\Catroot2\Edb.log



This command will force the catalog database to rebuild itself.



RESOLUTION
For additional information about how to resolve this issue, click the following article number to view the article in the Microsoft Knowledge Base:

817287 Windows Update 643 Error and the Catalog Database

This update resolves the issues associated with installation of patches and drivers that are dependent on the catalog database. This update also resolves issues associated with delays when you use Windows Media Player. Catalogs are a mechanism used by Windows to verify the authenticity and integrity of installed binary files. Unfortunately, the database that associates these catalogs with the appropriate files may become corrupted. This fix permits the database to repair itself when corruption occurs.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbQFE kbWinXPpreSP2fix kbfix kbBug kberrmsg KB817753

Technology: kbWinXPHome kbWinXPHomeSearch kbWinXPPro kbWinXPProSearch kbWinXPSearch

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