Jooel pointed this out in an MSN discussion.

The Microsoft Windows Malicious Software Removal Tool helps remove specific, prevalent malicious software
from computers that are running Windows Server 2003, Windows XP, or Windows 2000
http://support.microsoft.com/?kbid=890830

The tool is primarily intended for non-corporate users without an existing, up-to-date antivirus product installed on
their systems. However, the tool can also be deployed in an enterprise environment to enhance existing protection and
as part of a defense-in-depth strategy.


Microsoft® Windows® Malicious Software Removal Tool (KB890830)
http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en
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.

Quick Info
File Name: Windows-KB890830-ENU.exe
Download Size: 256 KB
Date Published: 1/10/2005
Version: 1.0


Malicious Software Removal Tool
Published: January 11, 2005
Online version:
http://www.microsoft.com/security/malwareremove/default.mspx