LifeHacker: Microsoft Security Essentials 2 Released, Still the Best Darn Antivirus Around

LifeHacker: Microsoft's next version of Security Essentials is actually a pretty great update from its already-great predecessor. Microsoft's option has always been adequate at finding new malware without definitions, but the addition of an heuristic engine bumps its power up quite a bit. It may be subject to a few more false positives, but you're much less likely to get hit with malware than ever before.