ZoneAlarm has it's own AV program. I have never used it, and I only mention it because presumably it is specifically designed to blend with ZoneAlarm.
I am a dyed-in-the-wool Norton fan who is now trying an interesting alternative - NOD32 - so watch this space. In general, though, despite the eminent views of many here present, I don't get on well with freebies. Just a personal thing.