Norton is shite. Some folks near me were having loads of probs with it,
so I told them to get rid and try Avast instead. After all kinds of issues,
the fact is that to uninstall Norton you either have to try and do it in
SAFE MODE and/or get an uninstall utility from Norton's site ...hmmmm :

XP SP3 seems to give some people problems on AMD systems. There
are fixes etc on Microsoft and elsewhere.
Vistaaaaargh is crap imho ... tried it ....hate it. My son loves it, but
ended up buying another HD to run/dualboot XP on because Vista
still does not run half the stuff he uses. Microsoft is actively developing
the successor to Vista in the hope that business and retailers will like
that when it comes. Meanwhile XP's product life and support has been
extended past its original planned sellby date.
A couple of things really annoy me with Vista.
The horizontal navigation ....if you are drilling DOWN to some file, then
going sideways is not intuitive.
The dumbing down of stuff like defrag ....grrrrrrr.
Regular housekeeping keeps XP running fine .... disk cleanup, defrag,
and registry and crap cleanup with CCleaner works wonders