I don't have a complete solution, just some thoughts that might help for now.
Whatever antivirus program you use, make sure it is always up to date. Some people purchase norton or mcaffee, or they get it with their computer purchase... then, the license runs out and they just use it without it being updated. I don't know if that's your situation at all but, figured it was worth mentioning.
IF you're ever stuck with an outdated AV program, there are free ones you can use instead.
If Norton is still licensed, see if you can run an update.
I'd also suggest Malwarebytes if you don't use that already. Download the free version, install it, update it, then run a scan. In most cases, a quick scan is sufficient. I'd start with that. If Norton has been running funny, chances are you will find something malwarebytes would like to remove for you.
Lastly... if this windows update is legit, and it's constantly doing this... I would guess that the update is failing ever time. What I'd suggest is making sure your AV is up to date, running malwarebytes, and then if that helps, do the windows update manually... You can poke around and see the update history and maybe you'll find the one that's failing.
sometimes updating manually will help you find updates you didn't even know were available and find the ones that might be causing trouble. Keeping windows up to date is important. Sometimes an update will make a big difference when things aren't working right.
I hope you get something figured out.
Edited by hamluis, 05 July 2011 - 01:56 PM.
Moved from XP to Am I Infected.