http://v4.windowsupdate.microsoft.com/troubleshoot/
Windows Update Troubleshooter.
Select a category below to get help on resolving your issue.
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Problem reaching Windows Update
Problem Downloading/Installing a Software (Non-Driver) item
Problem Downloading/Installing a Driver
Other
Or ,
1. Download This File to your desktop
http://v4.windowsupdate.microsoft.co...ansi/iuctl.cab
2. Go to the desktop and right click the iuctl.cab file.
3. Click "Extract to."
4. Point to a known location (like the desktop) and click "OK."
5. Go to the location you selected and right click on the iuctl.inf file.
6. Click "Install."
Reboot , now try.
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http://www.windows-help.net/WindowsXP/troub-08.html
Updates fail to install on XP .
Catroot2 folder on your system may be corrupt . Follow the steps mentioned below to rename the Catroot2 folder .
1. Close all open programs, including McAfee or other Anti-virus program.
2. Rename the C:\Windows\System32\catroot2 folder to C:\Windows\System32\CR2OLD by rightclicking on catroot2
and choosing rename. (If you have upgraded to Windows XP from Windows 2000, the CATROOT2 folder should be
located in C:\Winnt\System32 folder).
Now try installing the updates.
Or repair Update .
http://www.tweaktown.com/document.ph...d=434&dPage=11