Avast is also a fine A/V app...
For some ungodly reason the last time i tested it i could not get it registered properly on their end...so i had to do manual updates....that lasted about a week and i ditched it.
It would be interesting to find out if others are having any problems with Avast. As far as Free A/V's ,I used AVG for quite some time, but then someone here at CH mentioned Avast. I downloaded it (quite some time ago now) and have been very satisfied. Some time ago I opened a file that I shouldn't have (Duh!), and Avast sure let me know. All H broke out. Mind you by that time it was too late and no A/V would/could have saved me. I was fortunate enough to get the malware experts to guide me through cleaning my PC. and, at their suggestion I added additional protection ,such as MB ,S&D etc. So at this point I'm still using Avast, but I'm also a lot more careful now, and so far no more (Duh's.)