ClamWin

ClamWin is an Antivirus tool that comes with an easy installer and is open source code at no cost. It features: Scanning Scheduler; Automatic Virus Database Updates. ClamAV team updates Virus Databases on a regular basis and almost immediately after a new virus/variant is out; Standalone Virus Scanner; Context Menu Integration to Windows Explorer; Addin to Outlook. Please note that ClamWin does not include an on-access real-time scanner.