I used AVG and Avast in the past exclusively. If your using our machine as a HTPC or running windows 7, I would suggest trying the new "FREE" Microsoft Anti-virus. I plays nicer with all your windows network and firewall options and there are some other benfits for HTPC use, which I forget at the moment.

Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008