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

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.

This tool is not a replacement for an anti-virus product. To help protect your computer, you should use an anti-virus product.

Microsoft will release an updated version of this tool on the second Tuesday of each month.


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 here.