well , i didn't use any antivirus , but i use

1. CORE FORCE (host-based intrusion prevention system)
2. Arovax Shield v2.xxx (newest revision)

usually anything weird is trying to insert something to my pc , arovax will block it and if situation gets tough , i'll use lockdown security profile on CORE FORCE to monitor all traffic it's very effective and free of charge , though it's not any kind of antivirus software but it prevents any virus from running