New security features designed to keep its more than 110 million users safe debut in Avast 6, released today exclusively from CNET Download.com. They also have the added benefit of raising the competitive bar in computer security by pushing more and better free options to users. Avast Free Antivirus 6, Avast Pro Antivirus 6, and Avast Internet Security 6 all feature the new AutoSandbox and the WebRep browser add-on. (Click the links to get to the download page.)