Question:
I just installed Zone Alarm firewallSomeone suggested disabling XP's firewall to avoid conflict. Should I do that? Or is XPs firewall better?

Answer: -The odds of conflict are not high. However, you can disable Windows XP's firewall in favor of Zone Alarm, since ZA does a better job.

-XP's firewall only monitors incoming traffic. It does not monitor outgoing traffic so if you got a Trojan on your machine it would remain undetected while is was "phoning home". ZoneAlarm is a much better solution. I use Zonealarm Pro, and I have disabled the XP firewall since I can't see what it's doing.

-Get updated concerning the latest SP2 of Windows XP

http://www.microsoft.com/windowsxp/sp2/default.mspx