avast! Virus Cleaner is a free tool that will completely remove selected viruses & worms from your computer. It can handle the following virus families: Badtrans, BugBear, Nimda, Opas, Sircam, Sobig, Yaha, all including the latest variants.
MalwareBytes
Removes even the most stubborn malware.
Spam Bully
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AVG Anti-Virus
Well-known free antivirus protection software.
WinZip
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Download Manager
Free download manager & internet accelerator.