ClamWin is a free anti-virus scanner that is based on the Clam AntiVirus engine. It can detect and remove a wide range of viruses and spyware and offers email scanning (Outlook integration), automatic Internet updates, scheduled scans and email alerts on virus detection. ClamWin does NOT include an on-access real-time scanner, you need to manually scan a file (or run scheduled scans) in order to detect a virus.