If your computer is infected with some of the most rampant virus strains out there (and some of yours are because we keep getting the emails!), there is a free virus removal tool that can do the job. Download VCleaner.exe from Grisoft and run it in Safe Mode.
Download the remover vcleaner.exe. Restart your computer in Safe mode and run the remover on the infected computer.
Note: Some viruses can stop the action during the removing process. In this case rename the vcleaner.exe to some different exe file (e.g. something.exe). Restart your computer in Safe mode (recommended) and run the remover on the infected computer
Virus Removal for: I-Worm/Bagle.A-Z, AA-AC, I-Worm/Bugbear.C-D, I-Worm/Netsky.A-Z, AA-AC, I-Worm/Sasser.A-F, PSW.Bispy.A-C