So I've tried some of those "free" anti-virus programs, they seemed to slow my system down. When I heard how great Cyberdefender was (from my neighbor), I was a little hesitant because of it starting with a free download, but I decided to try it anyway. I tried it, and i liked it. I like that it's fast, has a clear user interface and it deals with trojans, spyware and viruses, all in one download. I did have to pay for the full verison to remove viruses, cause the scan only was free, but it was worth it. i got a few other bells and whistles, to include the my identity toolbar and 24/7 support. It's been a great investment. I'm glad I tried it cause now I feel safe whenever any of my family members use the computer.