ClamWin-Free Antivirus

ClamWin is a Free Antivirus program for Microsoft Windows 7 / Vista / XP / Me / 2000 / 98 and Windows Server 2008 and 2003.
It comes with an easy installer and open source code. You may download and use it absolutely free of charge.

Features

• High detection rates for viruses and spyware;
• Scanning Scheduler;
• Automatic downloads of regularly updated Virus Database.
• Standalone virus scanner and right-click menu integration to Microsoft Windows Explorer;
• Adding to Microsoft Outlook to remove virus-infected attachments automatically.

You can download this from here.ClamWin