>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.<

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.