Comodo Internet Security - balík s:

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.

Jde stáhnout i samotný antivir.

Vše je zdarma (podle mě poměrně dost kvalitní, a bez reklam)