I just dumped Nortons too because it was conflicting with my video drivers of all things. I now have AVG antivirus and the windows firewall. All seems well now. I've heard a number of these sorts of stories with Nortons stuff over the years. They also regularly screw up their live update, I've had many problems happen after running a live update!

Injustice will be avenged.
Cofiwch Dryweryn.