It is important to stay safe from viruses viruses like torjans , worms, malwares and spywares can damage your pc and make it irreparable. Stay safe while you are online and for free . Today free versions of popular antiviruses are available some of the are
1. Avast free : Avast is a really good antivirus protecting your computer from multiple viruses and spywares. There are added new features like the intelligent scanner and the silent gaming mode. http://www.avast.com/eng/avast_4_home.html

2. AVG antivirus: monitors websites very well, installation is easy too. Best part of this is it is designed really well.

3. Avira antivir: Avira has a fast and easy scanning and a good user interface with auto scanning.

Mac free, bit defender,stinger and Symantec are other very popular antivirus softwares available