Windows OneCare Live

Microsoft is working on a program that is called Windows OneCare Live. The goal is to help your PC run smoothly, and free of the influence of spyware, viruses, and other bugs. The suite includes a Backup, Virus scanner, Firewall, Windows Tuneup, and more.

Remeber that it is currently in BETA so everything may not work as well as it should. It is currently open only to residents of the United States.
http://www.windowsonecare.com/prodinfo/Default.aspx