HouseCall is a FREE Web-based tool designed to scan your PC for a wide range of Internet security threats including viruses, worms, Trojans, and spyware. It also detects system vulnerabilities and provides a link so you can easily download missing security patches. After each scan, HouseCall delivers a detailed report, which identifies security threats detected on your computer.

Might be old news, but what the heck, I just discovered it today. So anyone not yet scan their computer should go ahead and try out the new Trend Micro HouseCall now!