Scott,
1) use one link offered above or/and search on google how to COMPLETELY CLEAN UP Norton antivirus and related software. I had some problems myself, after cleaning it worked so much faster it was like I had a new computer.

2) As a matter of fact, I DON'T have any antivirus software running in my home PC. I only have the XP firewall, installed in the recent months. I had ONLY ONE virus attack in many years, say more than 5. And i have peer to peer programs running, and I browse the internet and download whatever I see. Though I don't recommend it to anyone that does "work" on their PC's, it has served me well.