Have you tried XP's Disk Cleanup (cleanmgr.exe)?
Look in your Windows folder for files with names similar to this:
$NtUninstallKB946648$ These are the uninstall files for updates that you
have downloaded and installed. These files can take up a lot of room so if
your machine is stable, these files can be deleted. MVP Doug Knox has a
utility to remove the files plus the associated registry entries:
http://www.dougknox.com/ In the left panel, select: Win XP Utilities. In
the right panel, select: Remove Hotfix Backup Files.
Once the files are gone, you will not be able to uninstall the updates;
however, if the PC is stable, there should be no need to remove them.
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Regards
Ron Badour
MS MVP
Windows Desktop Experience