You can reset the windows update components
. See if that helps if not then:
Do you get a particular error number?
Have you tried to install SP2 and failed?
In ALL the threads I read concerning this issue when I googled it the problem ended up being caused by some sort of Malware. If the above link doesn't work, I would persue the malware possibility.
EDIT: Oh yeah, it looks like malware. When I posted I hadn't yet reached THIS
thread on the problem from........... here, Bleeping Computer lol.
I would disregard my suggestion to reset the update components and head straight to the malware section.
Edited by DeathStalker, 04 July 2009 - 09:36 PM.