From my experience Norton Internet Security was the problem - it uses too
many of your computer resources. I switched to Avast AV and use Windows XP
Firewall, and Ad Aware. I have a wireless router which has a built in
firewall. I think these internet security programs are just getting too top
heavy with all of the different processes such as Spam Alerts, Popup
Blockers, AV, Email scanners, etc , etc, etc. I used Norton for quite a
number of years and have decided not to continue. I then went to AVG AV with
no problems until at th end of December 2004 they too decided to bring out a
one in all Internet Security Program and it to slowed down my computer. I
wish that the companies that supply these programs would learn that, " if it
works stop fixing it !! " I don't have any difficulty running with SP2.
I have run both SP2 installed over my system and after a crash as a fresh
install directly over a fresh install of Windows XP Home Edition. No issues
were noted.