>>NetBIOS is automatically supported by both TCP/IP (NBT) and NetBIOS over IPX unless you take steps to disable it (in the TCP/IP settings or IPX/SPX Compatible Protocol transport mode.<
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>Thanks for your response Ed. I have a small peer network using NetBIOS. I upgraded 1 PC to XP Pro which disconnected it from the LAN. I added all available protocols and the settings you mentioned but I still do not have a connection to the LAN.

That sounds like you're using NetBEUI rather than NetBIOS. Switch all the other stations to either the TCP/IP protocol or the IPX/SPX compatible protocol. You'll need to do some configuration to make TCP/IP work.