i Think Microsoft Malicious Software Removal Tool  is the best program to detect and remove malicious software (including Blaster, Sasser, and Mydoom) from your computer.

Protector Plus - Windows Vulnerability Scanner checks your system for Windows Vulnerabilities.Windows Vulnerability Scanner guides you to update with the right patch to make your system more secure.

Multi Virus Cleaner is a small freeware utility to remove from you computer the most important viruses, worms and other malware such as: MyDoom, Bagle, Sasser, Zafi, Netsky, Klez, Sobig, Welchia and Blaster.

Requirements:

· Processor 400 Mhz
· 128 MB RAM
· SVGA 800×600 display
· 256 colors

Norman Malware Cleaner is a Norman program that can be used to detect and remove specific malicious software (malware).

Note that it should not be used as a substitute for running normal proactive antivirus protection, but rather as a reactive tool to handle systems that are already infected.