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Free Firewall for Windows Systems
免费视窗版本的防火墙

A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications.
在电脑运算领域中，防火墙是一项协助确保资讯安全的装置，会依照特定的规则，允许或是限制传输的资料通过。

Powerful and require skill to set.
功能强大。使用时，需要对电脑比较了解。
1) Comodo Firewall (Can be install without Antivirus ; 可以不要安装防毒系统)
2) Outpost Firewall Free (No auto-update. Take less memory ; 不能自动更新)
3) Online-Armor (No auto-update ; 不能自动更新)

For average user. Please tune-down the security setting.
Host-based IPS (HIPS) will be disabled.
适应于一般用户。（降低保护范围）
1) Comodo - Right-click [Tray Icon] -> [Defense+] -> [Disabled].
2) Outpost Firewall Free - Right-click [Tray Icon] -> [Settings...] -> [Host Protection] -> [Optimal].
3) Online-Armor - Right-click [Tray Icon] -> [Program Guard] -> [disable the HIPS component] . Make sure the firewall component is turned on! 请留意，防火墙一定要开启！
4) ZoneAlarm Free Firewall (No setting required)
5) Sunbelt Personal Firewall (No setting required)

Best Firewall for Novice Users
最容易使用的防火墙。
1) The Windows build-in firewall (No installation and setting required)
1) 视窗内建的防火墙。（不需要安装，不需要调节）