McAfee is an industry leader in computer protection and VirusScan is their #1 defense against viruses. This software comes with a ScriptStopper, to prevent virus to propagate from one computer to another via email, and WormStopper. Some downsides to the program are it doesn't provide instant message protection, P2P/file sharing protection or registry startup protection. McAfee is a name brand product that does an excellent job at detecting and removing viruses. Their update process can be somewhat tedious and their support department needs to answer their emails in a timelier manner.
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