XP term. cannot connect to 2000 server

I have a Dell Inspiron laptop which I am trying to add to our current network.
Our server is running Windows 2000 Server.
The laptop is running XP.
I have set up the laptop using the XP wizard, and can connect to the web through the router.
I can see the workgroup using windows explorer, but cannot connect to the server.
Message received say that the machine does not have the proper authentication.
On the server, the machine name is entered with the proper rights, and the message is that the
“server \\Wstation cannot be found.
Any help will save the hair that is remaining.
Ken