Need a good firewall for Windows 2003

[chicagoSun]

PCillian from trend Micro enterprize edition. We'll be installing 2003 again shortly and I'll let you know.

[PIPER]

This is one of those different strokes for different folks issues...I have been using sygate for quite awhile without any issues along with a purchased copy of AVG and am quite satisfied with the results...

[wykis]

In Windows Help, I Found How To Set Up Basic Firewall... If You Wanna Try It, Go There :ms-its:\WINDOWS\Help\RRASconcepts.chm::/mpr_basicfw_configure.htm { only for windows 2003 }.
When I Am Trying To Do These Actions:
On the NAT/Basic Firewall tab, do one of the following:
Click Public interface connected to the Internet, and select the Enable a basic firewall on this interface check box.
Click Basic firewall only.


I Can';t Do Them Because Public interface connected to the Internet isn't enabled. How To Enable It??