Try some of them out. Google combo compatibility or go to forums and read the discussions. It's kind of cool to see what does what and how well they work.
Most of the stuff on this site I've tried at one time or another, and it's all free. The only one I really haven't tried is Avira.
I like C.C. Cleaner, AVG 9.0, Spybot Search and Destroy, MSE, Malwarbytes and Commando.
I don't like Trend or Norton (and they aren't on this page anyway)
These are all carefully chosen by "those in the know..."
Have fun homo (phobics)
