Whats the Best Free Antivirus Software Online?

What is the best free antivirus? I have tried a few now but they haven't worked to fully clear out my system of virus and it still runs slow, are some of these just too hard to get rid of, because I'm wondering if I should just reinstall windows? I hate when I find one that's free but it's just a... show more What is the best free antivirus? I have tried a few now but they haven't worked to fully clear out my system of virus and it still runs slow, are some of these just too hard to get rid of, because I'm wondering if I should just reinstall windows? I hate when I find one that's free but it's just a trial version :/ What's the best free antivirus anyone knows of, and has tried?
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