SP 3 is working fine on my XP machine.
However
Vista on my main home machine

Yesterday it decided to play up. Running slower and slower and explorer not responding which meant many applications not starting up at all

After various tries it crashed completely and then took 15 mins to reboot and load windows. Nortons wasn't working and the firewall was turned off.

System restore, run Nortons update, reboot, still slow. Contemplating restore to factory settings but as I was about to go out I left it running a complete scan.
It was still running the scan when I returned but eventually finished with only one 'fix' (a tracking cookie) Reboot and would you 'adam and eve it', the bloody thing works perfectly.
