During installation of NT4.0 server, you will have an option to install NT server as
1) standalone server 2) PDC (primary domain controller) or 3) BDC (backup domain controller)

You probably already did it, but just in case, did you choose PDC..and also are both the xp and NT server PCs on same subnet...

Because if they are not, and are separated by a router you have to either configure WINS server, force the router to forward UDP broadcasts (NBT) or configure lmhosts or hosts file (not sure on XP),

Basically by default the way the XP PC will look to find the domain controller is by sending out UPD/netbios broadcasts...

Just curious, may be a stupit question, can the two devices ping each other...


cheers,