fenix2000,
Which IP address are you using ? It should be 203.81.47.74. The XP firewall shouldn\'t prevent you from reaching the server, so it has to be something else. Some providers are running a firewall integrated with their proxy, if you are still unable to connect, you should contact them to be sure.
BTW, don\'t disable your firewall, it\'s not worth taking that risk. Just enable incoming and outgoing UDP on port 13331.
You can try to type this in the command shell (Start->Run->cmd) :
ping 203.81.47.74
and see (or report here) the result