There are plenty of free AV that you can try out - I use both Avira and Avast and like them both. The only thing with free AV is a nag screen to get you to upgrade to the paid version but I don't really care about the pop-ups.
Seems to be more pop-ups with Avira than Avast. -- Brian
"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain