Get AVG it's free and you can buy the regular program which I have. It's the best program out there even better than McAfee, Norton, and such.
I know this how! I had both Norton and McAfee on few years back along with AVG. AVG detected stuff that Norton nor McAfee didn't.
NEVER download a free program without first checking what it's all about. Nothing like this is ever free. If it's not miliacious in some fashion at minimum it still has robots in the program that tracks everywhere you go online and check and see what you have on your system.