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What firewall is better to install?

I have the firewall that came with my windows xp. I want a better one. What is a VERY good firewall i can download and use for free that dosen't slow down my computer? :(

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What is wrong with the Windows XP firewall?

I do not think you will find what you are looking for.

Firewall software is pretty basic. You provide it a list of ports to block and then it either blocks the traffic or allows it. The Windows XP firewall does this just fine.

If you are wanting something more than a firewall -- such as NAT (network address translation) or port forwarding -- then please provide more information on what you are trying to do.

What specifically do you need that the Windows XP firewall does not provide?