See:
http://support.microsoft.com/kb/943144
Usually method 1 is sufficient but you may have to do method 2.
K
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"rkillings" wrote:
> I had to change out the hard disk and do a clean install in early January.
> For convenience, I made a slipstreamed setup CD of WinXP with SP3 (downloaded
> from MS site). Installation seemed to go fine, no problem. I did NOT restore
> anything from backup; I installed all the applications I use from scratch.
>
> One was Microsoft Update, and I see from my WU history that I used it to get
> an ATI hardware driver update on Jan 11. Since then I have been getting
> Windows Defender updates with great regularity, but no other security updates.
>
> On the recent Patch Tuesday, it became obvious that something was wrong on
> this machine because WU wasn't telling me about the updates I'd got on all
> the other XP machines in this household.
>
> Pray tell, MVPs, what steps do I try first? Unregistering and reinstalling
> the Windows Update program? Uninstalling and reinstalling SP3?
>
> I do run antivirus and other antispyware programs, but of course none of
> them were present during the initial install.