ClamWin Free Antivirus 

MS Windows front-end to Clam Antivirus (http://www.clamav.net). Includes scheduler, virus database updates, standalone scanner, context menu integration to MS Windows Explorer and Addin to MS Outlook. Also features easy setup program.
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ClamAV For Windows 

An open source command line anti-virus scanner for Windows that is fast and powerful and can easily be integrated with server applications for use in a mail server or proxy server. It can also be used to scan individual files or folders.
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