Unlike other programs on this list, Clam is not a realtime virus scanner, meaning it won't notify you the instant an infected file gets saved to your hard drive. Because of this shortcoming, ClamWin is probably not a good choice for novice users. It does, however, support scheduled scans and integrates with Windows Explorer so you can manually right-click and scan files. It also integrates with Microsoft Outlook and can remove infected attachments automatically.
You can get on-access protection with ClamWin by integrating it with WinPatrol or Spyware Terminator.
Get it from:
http://www.clamwin.com/content/view/18/46/