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Microsoft has released the Microsoft Windows Malicious Software Removal Tool
to help remove specific, prevalent malicious software from computers that are
running Microsoft Windows Server 2003, Microsoft Windows XP, or Microsoft
Windows 2000. The Malicious Software Removal Tool supersedes all
virus-cleaner tools that were previously released by Microsoft. You can
download the Malicious Software Removal Tool from the Microsoft Download
Center. You can also run an online version of the tool from the Malicious
Software Removal Tool Web site on Microsoft.com. To run the Malicious
Software Removal Tool from either location, you must log on to your computer
with an account that is a member of the Administrators group. If you are
running Windows XP, you can also run the Malicious Software Removal Tool from
the Windows Update Web site or by using Automatic Updates.
http://www.microsoft.com/security/malwareremove/default.mspx