Windows Malicious Software Removal Tool – is designed to scan and remove certain malware types from heavily infected machines.
It supports Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2003, both 32 and 64 bit.
Main malware families covered are Sasser, MyDoom, Blaster and this utility is updated every second Tuesday of each month and delivered also through Windows Update.
It’s a free product that can save your computer in case your current security software can’t handle the infection. However, it offers only on-demand scanning, but not realtime protection, so it is not intended to replace a full security solution.