For anti-virus, try Avast. Get it at Avast.com. Best of all, it's free, is updated real regular.
Thats also all I run, other than the Xp firewall and my network firewall.
I changed from Norton to Windows Live Onecare. It doesn't comsume near the resources as Norton and has worked great since I started using it (approx 8 months ago).
I have been using AVG free for over a year now and have had no problems. It has stopped many a virus. I use it on 9 different computers.I have been using AVG free edition for a while now and it has worked
great so far. Always upgrading and it caught a Trojan last night and
fixed it right away.
Not too familiar with Onecare what is it 50 bucks a year ? You running Vista ?