Many people believe that if they have an antivirus installed in PC then their computer is safe. False! Without the presence of a hardware or software firewall PC is extremely vulnerable to attacks, whether we think of hackers or worms.
Many years ago I made contact with the Comodo Firewall and it left me a good impression, so I prefer to consider it a top field of software access to PC resources.
Key featuresIt protects your PC from Internet attacks, monitors and controls the access and behavior of the files from your PC, prevents malware to be installed in your PC, it uses Auto Sandbox Technology (viruses and other dangerous programs are isolated in a virtual operating enviroment), Cloud based Behaviour Analysis (to prevent zero-day malware) and Cloud based Behaviour Whitelisting (to identify safe files and vendors).
License:You can download and install Comodo Firewall for personal use.
Minimum Requirements:OS: Windows 7 (32 bit and 64 bit), Windows Vista (32 bit and 64 bit), Windows XP.
RAM: 128 MB
HDD: 250 MB free space