I've been using Microsoft Security Essentials which, from what I have read, seems to be one of the best anti-virus/spyware apps you can use. It seems like when I did use Avast, there was something really annoying about it but I can't remember what.
I <3 Avast. I tried MSE for a while and I hated it. It completely deleted a couple programs out of a false positive and I was unable to recover them. At least when AVAST picked them up I had the option to ignore. Avast all the way!!!
I'll have to check out the latest version. I think mine has a woman's voice, which was pleasant, then we had a rough go at it for a while. I eventually broke up with her and disabled her voice feature, now things are going much better. She does her job and we don't have to talk anymore...wait...
I would never die for my beliefs because I might be wrong. ~Bertrand Russell