Windows Server 2003 Firewall Software?


I'm looking for a Firewall software based for windows server 2003 R2? I'm currently using sunbelts anti-virus software because its designed to use less CPU useage and i kinda need the same from the firewall i cant allow it to be resource hungry!

If anyone knows of a firewall based that wont use a lot of resources please let me know!
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I use ISA Server 2004 at the moment although a newer version is available now.  I find it very good for setting up firewall policy rules etc.

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