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Comodo FirewallScreenshot 

 

Comodo`s free Firewall keeps viruses, malware, worms, Trojans, hackers, and all Internet threats from accessing and harming your PC. Using a Comodo-exclusive list of over 15 million known PC-safe files, Comodo Firewall rejects any and all suspicious files, keeping them from executing until you can make sure they`re safe. With free automatic updates for the latest in PC protection.

Screenshot of Comodo Firewall