1.Avast Free Antivirus
Avast Free Antivirus is a full-featured product, with the same antivirus and anti-spyware scanning engine used in our premium products. Leaner and meaner version 6.0 provides even faster protection than its predecessor and offers a web-reputation browser extension as well as virtualization technology. Accurate threat updates via avast. CommunityIQ technology ensure worry-free downloading, surfing, social networking, and gaming--for over 170 million registered users (and over 130 million active users).
2.AVG Antivirus Free Edition
AVG Anti-Virus Free offers basic anti-malware and anti-spyware protection that ensures users stay safe online. Emerging threats are identified "in the cloud" and prevented from infecting your computer via automatic updates. Information about the latest threats is collected from customers who choose to participate, enabling us to constantly identify new threats, supporting everyone in the AVG Community Protection Network and helping us to provide superior anti-virus protection. You want to search and surf, but you don't ever want to go to any infected websites. AVG helps you out by clearly alerting you to threats and keeping you clear of them.
3.Avira Free Antivirus
If you don't have virus protection, your PC will be infected with malware in a matter of minutes. Avira Free Antivirus 2012 offers basic protection against viruses, worms, Trojans, rootkits, adware, and spyware that has been tried and tested over 100 million times worldwide. What's more, it is available free-of-charge. It not only protects against these types of malware, but offers as well, in case of an infection, the possibility of removing viruses very easily and repair the system automatically.
4.Ad-Aware Free Internet Security
Ad-Aware Free provides core protection against Internet threats. Featuring real-time anti-malware protection, advanced Genocode detection technology, rootkit protection, a scheduler, Ad-Aware Free Internet Security gives you the power to protect yourself online. Ad-Aware Free version is a complete malware protection that now combines Lavasoft's pioneer technology for anti-spyware with traditional anti-virus protection.
5.Norton Antivirus 2012
Norton AntiVirus 2012 protects your PC against the latest viruses, spyware, and other threats. It delivers fast, powerful online protection to keep you a step ahead of cyber attacks. It lets you chat, email and share files without worry, updates automatically, offers easy-to-use features, and includes free customer support during your subscription period.