Every computer user needs some security software to stay protected from the viruses, trojans and other malware. Since most of the malware is targeted towards Microsoft Windows operating system, you have to be extra careful if you use Windows and must install an antivirus software and keep it updated regularly. But you do not have to spend lots of money on buying the antivirus software when you can install a free antivirus software. Today Windows users can choose from a variety of freely available antivirus solutions.

Here is a list of some of the well known free antivirus software for Windows :

1. avast! http://www.avast.com/

2. Avira http://www.avira.com/

3. Microsoft Security Essentials http://www.microsoft.com/en-in/security_essentials/

4. AVG http://free.avg.com/

5. Panda Cloud Antivirus http://www.cloudantivirus.com/

6. PC Tools Antivirus http://www.pctools.com/free-antivirus

7. Rise Antivirus http://www.freerav.com/