Free Antivirus – Comodo Internet Security Free
Comodo Internet Security Free Features
* Antivirus, Anti-Spyware, Anti-Rootkit & Bot protection
* Defends your PC from Internet attacks
* Detects and eliminates viruses
* Prevents malware from being installed
* Auto Sandbox Technology™
* Easy to install, configure and use
* Free to both business and home users
* 60 Days of FREE GeekBuddy live remote PC support
Comodo Internet Security Free Includes:
* Antivirus: Tracks down and destroy any existing malware hiding in a PC.
* Anti-Spyware: Detects spyware threats and destroys each infection.
* Anti-Rootkit: Scans, detects & removes rootkits on your computer.
* Bot Protection: Prevents malicious software turning your PC into a zombie.
* Defense+: Protects critical system files and blocks malware before it installs.
* Auto Sandbox Technology™: Runs unknown files in an isolated environment where they can cause no damage.
* Memory Firewall: Cutting-edge protection against sophisticated buffer overflow attacks.
* Anti-Malware Kills malicious processes before they can do harm.
System Requirements:
Windows 7 / Vista / XP SP2
128 MB RAM / 350 MB hard disk space


i am using bitdefender… will check this one in my other system