ClamWin Free Antivirus
ClamWin Free Antivirus is a fully featured completely free antivirus for the windows platforms. A lot of antivirus software are available like Norton Antivirus, McAfee etc but they work only for a limited time after which you have to pay without which they cease to update the virus databases.
But ClamWin Free Antivirus uses the GNU general public license by the free software foundation and is open source software. ClamWin Antivirus is a light weight application and hence consumes less of your system memory. The features of ClamWin Antivirus are on par with the commercial antivirus packages.
A simple standalone scanner interface from which you select the drives to be scanned and viruses are detected. Virus updates for ClamWin Antivirus are available free and are not time limited. Updating the virus database is really simple. The virus database is updated several times a week.
The only draw back of ClamWin Antivirus is it cannot be configured to check files as they are opened or executed. This feature is commonly called “on-access scanning”. You have to manually scan for viruses in the system at constant intervals. But considering the free factor of this antivirus, it is really worth installing this software.
Also if you are using free antivirus like AVG, Avast or AntiVir then ClamWin would be a nice add-on for your free Antivirus tool collection.