ClamWin Portable

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          ClamWin is a Free Antivirus for Microsoft Windows. It provides a graphical user interface to the Clam AntiVirus engine. It features:
High detection rates for viruses and spyware
Regular virus database updates. ClamAV team regularly updates virus databases to include a new virus/variant immediately after it appears
Standalone Virus Scanner

            Please note that ClamWin Free Antivirus does not include an on-access real-time scanner, that is, you need to manually scan a file in order to detect a virus or spyware. Also, ClamWin Portable has scheduled scans and updates disabled as they are not used in a portable scenario.