Well, norton 2000 doesn't work on Win Xp, if I recall correctly. At least it didn't work on my computer.
I use Norton Systemworks 2003 and I got 'regsrv.exe' virused with Backdoor.OpticsPro.1.2b. Stupid Kazaa... Norton can't repair it and the registry seems clean <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />.