winxp client problem in win2000 server

hi guys!
hope you can help me, we have 2 winxp client in a win2000 server, from the winxp client, it can access other pc including the server (DC), but from other client and from the server, the winxp client cannot be access and an error appear …”the network path was not found”.
What could be wrong with the winxp client settings?