avast: pros: works great / cons: some issues with battlefield3
avira: pros: file scaning is called "luke filewalker" / cons: random ads popup
AVG: cons: issues with blocked applications
protip#1: use this
http://virusscan.jotti.org/en to scan suspicious files
protip#2: use a linux partition(or a virtual machine) to browse internet, it's free and linux is top tier OS