Not intended to be a substitute for your anti virus software.
http://www.microsoft.com/security/malwareremove/default.mspx
If installed via Windows Update, the tool runs in silent mode.
Locate the file named MRT.LOG in the ..\Windows\Debug folder.
Start/Run and type: notepad %windir%\Debug\Mrt.log
This file has the report of the scan.
It is an Internet worm tool that searches for the following...
Win32/Berbew
Win32/Doomjuice
Win32/Gaobot
Win32/Msblast
Win32/Mydoom
Win32/Nachi
Win32/Sasser
Win32/Zindos
ONLY for; Win2K, WinXP and Win2003 Server.
Quote “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 Centerâ€
http://www.updatexp.com/malicious-software-removal-tool.html
Malicious Software Removal Tool - Published By Marc Liron - Microsoft MVP
http://support.microsoft.com/?kbid=890830
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