Firewall

Zone Alarm
Provides solid protection against hackers of the Net. A stateful firewall to control access to your computer and the invisibility of the PC for the Internet and potential intrusion. Size: 44.78 Mo  Operating system: Windows XP/Vista/7 Licence: Free Language: English
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Comodo
Comodo Firewall is a firewall comprehensive and effective, with a clear and intuitive interface from which you will be able to manage all the features offered. Simple to use, this application block unwanted guests before they generate damage on your computer. Size: 34.29MB Operating system: Windows XP/Vista/7 Licence: Free Language: English
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PC Tools Firewall
PC Tools Firewall Plus protects your computer from intrusions from the network or Internet. This firewall monitors your applications and blocks Trojans, keyloggers and other malware, regardless of your activity (web browsing, games, office, etc.).. Size: 10.31MB Operating system: Windows 2000/XP/Vista/7 Licence: Free Language: English
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Other useful links:

http://www.firewall-gratuit.com/