On server:
Start>Run...>type in 'cmd' into the text box.
A DOS prompt will open. Type the following:
ipconfig
This will give you info about the servers network configuration. Write the IP address down and take it to the XP computer.
At the XP computer:
Start>Run...>type in 'cmd' into the text box.
A DOS prompt will open. Type the following:
ping x.x.x.x
Replace the x.x.x.x with the IP address you got from the Server.
It will then say that the destination host is inaccessible or that you get a response.
Post back what the response is.