Microsoft's Malicious Software Removal Tool

The Microsoft Malicious Software Removal Tool is an anti-malware utility that checks computers running Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software—including Blaster, Sasser, and Mydoom—and helps remove malware and any other infections found.

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

                                            

Note: The version of the tool delivered by Microsoft Update and Windows Update runs in the background and then reports if a malware infection is found. 

To try this, Click here