I hate Norton. My step-dad insists on using it on his PC. Had the misfortune of having to install it for him while he was away - couldn't believe how long it took. Then needed two restarts (lengthy ones), and proceeded to fill the tasbar and IE toolbars with Norton-related rubbish.
Caused a lot of people a lot of problems in Halls (Uni) too. Norton's firewall seemed to hate network and would block people's MSN access. Really odd.
Even Norton for Macs is rubbish; when I first met my housemate (also in Halls), he had it and it blocked him from getting onto secure websites or from using software that uses HTTPS to conenct (such as Messenger). Removed it, and everything was fine again.