Which free Antivirus can you trust?

Great article from PCWorld that discusses this very issue.  Paid or Free?  I get this often.  Paid Antivirus programs do have some advantages, but for what I see, most computer users get infected from their own bad online behavior.  No antivirus will help you if you insist on watching porn, clicking on unknown links, pop-ups, and downloading free movies and music.  To that end, save yourself the money and get a good free antivirus program.  If you are the sane Internet surfer, those who stay away from the infectious behaviors, then a free antivirus is more than enough for you.