Microsoft has released version 3.16 of their Malicious Software Removal Tool

The Microsoft Windows Malicious Software Removal Tool checks Windows computers for and helps remove infections by specific, prevalent malicious software; including Blaster, Sasser, and Mydoom. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed. The tool creates a log file named mrt.log in the %WINDIR%\debug folder.

Editors Note: The version of this tool delivered by Windows Update runs on your computer once a month, in the background. If an infection is found, the tool will display a status report the next time you start your computer. If you would like to run this tool more than once a month, run the version that is available from this Web page or use the version on the Malicious Software Removal Tool Web site.
[License: Freeware| Requires: Win All | Size: 11.7 MB]

  Microsoft Malicious Software Removal Tool 3.16