Question : can not join XP-Pro PC's to domain

I have a 2003 SBS installed from Dell with default settings.  I have assigned static ip addresses to all units on the same subnet; 192.168.1.X
I have two XP-Pro clients.  I cannot join them to the domain.  I get the message that a domain controller can not be contacted.
I can ping the SBS server via IP and via name. I can ping the clients by IP and by name.  I have the firewalls off on all machines since they are just hooked into a known good switch with no external connection.  As well as I can tell , DNS is set up correctly.
Any ideas?

Answer : can not join XP-Pro PC's to domain

The computer account doesnt need to in AD first.

As long as the account used to join to the domain has sufficient permissions  it will creat the account and put in the computers O.U by default.

It does sound like it may be DNS related.

Check on your DNS server (probably best to use your AD Primary Domain controller) and make sure the P.C.s and servers are registered in the forward lookup zones with the correct IP addresses.

Have you managed to join ANYTHING to domain (other servers etc)

Also try and browse to your domain controllers network shares (sysvol or netlogon)

\\YourDCname\