Avast is very good. Security essentials is also good and trouble free. malwarebytes antimalware (the free version) is more a cleanup type product unless you get the paid version which has automated scans.
Really a decent antivirus is all you need if you don't have someone on the PC who is doing "dumb" stuff. (file sharing, torrents, clicking on "your computer might be infected spyware adds)
Haha, true that. I'm smart about my computing, I don't prefer to use instant messengers, I know people love to send loggers and such through them, so I just stopped using them. I do use torrents, but I'm smart about it. I doubt picking a torrent that only has .mp3 files in it will harm you.
I'm thinking about MSE / malwarebytes or possibly comodo? I've been seeing and hearing a lot of people say comodo is good.