Comodo Internet Security
suite is a free fully loaded application which 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.
Other Free Security Apps: http://www.wnycomsoc.org/community/index.php/topic,956.msg1388.html#msg1388