Is there a firewall that works?

I have been using AVG firewall to protect my computer; however, when I connect my smart phone the fire wall goes to "not fully functional".  I have been working with AVG to resolve this problembut have finally been told "The AVG Firewall is fully functional only in case that you are using single network interface while using Windows XP 64-bit ".

Is there a firewall that will work?

 I have been using COMODO firewall for x64. you might try that

Thanks for the info.  I've been trying Comodo and it does resolve my problems.

Hello,

 I use ghostwall. It's also free.

http://www.ghostsecurity.com/ghostwall/

There are a few others but I don't have the links. Zone Alarm is good but not sure if it supports XP x64 or not.

Chris

 I'm using this without any problems, http://usa.kaspersky.com/products_services/internet-security.php

Very nice package.  No problems whatsoever.