for Windows XP, Windows 2000, and Windows Server 2003 ONLY is downloadable from click here
This tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found.
Microsoft will release an updated version of this tool on the second Tuesday of each month. New versions will be made available through this Web page, Windows Update, and the Microsoft Download Center.
An online version of this tool can be used at click here
Probably most WinXP and Win2000 users already know about the tool, but some newcomers to the forum may not, of course. TC.