ClamWin is an opensource & FREE Antivirus for windows. There is also availabe its portable version so that you dont need to install it just run the executeable file to use your antivirus...

Here you can download FREE ClamWin Antivirus....!!!

Clamwin

Alch, a software company made Clamwin, a antivirus software In support of windows OS. It is a very effective and new antivirus software but still offers good features considering its high scanning speeds and detection rates. The virus software offers other very interesting stuff but the main aims are still to be made true. Clamwin has been improving its antivirus capabilities but as far is virus protection is concerned clamwin has to take big steps. Get its latest updates, versions and news at Funrocker.com. download it here absolutely free.