It messes up Norton AntiVirus and ZoneAlarm. DAMN YOU MICROSOFT! You are ruining my security mesures that I put in place! (Check my sig for more info).
I guess I'll get the latest versions of ZoneAlarm and Norton AntiVirus, that work on SP2 before upgrading. If they screw up after updating, I'll reinstall them.
And I'll take the computer off my network (with broadband), so it can't go broadsating all my info to bastards while ZoneAlarm is down.