Hi,
First of all, I agree completely about turning off all firewalls and anti-virus programs except one of each.
My recommendation for a free Anti-virus program is AVG. This program is as good as any paid program you can buy.
I can say the same about Zone Alarm that was mentioned earlier. This one is top of the line also and it is free:
AVG Anti-virus
http://free.grisoft.com/doc/1
Zone Alarm Firewall
www.zonelabs.com/