Clam Antivirus is a virus and spyware scanner whose database is constantly maintained by a group of volunteers, and updates are always available for free. Note that the program does not contain an on-access real-time scanner. You must manually scan a file in order to detect malware.
ClamWin Portable is a portable wrapper for ClamWin. Alternately, instructions are available to make the official program portable.
To automatically update virus database periodically or during startup, see ClamWinPortableDBUpdate.
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