The Microsoft Windows Malicious Software Removal Tool checks computers running Windows XP, Windows 2000,Windows Vista,Windows Server 2003, & Windows Server 2008 for infections by specific, prevalent malicious software including Blaster, Sasser, & Mydoom & helps remove any infection found.

When the detection & removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected & removed.

Link: Malicious Software Removal Tool 2.9