Take a look at FAQ#15468
Also, IME XP is
much more sensitive to DNS settings than any earlier OS. This seems especially true if the workstations are members of a domain. Ideally, all XP workstations should have their DNS server set strictly to a Windows 2000 DNS server, which is configured to forward requests as necessary. I don't have any experience running XP workstations against an NT4 server but it's something you might try.
A KB article on W2K DNS:
http://support.microsoft.com/?id=291382
Regards. Al
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