WinXP in NT4 domain

I may have asked this previously, so I apologize if I’m repeating myself, but…
I recently introduced a WinXP Pro machine to our NT4 domain. Unfortunately, the only servers I am able to map to are the PDC and my web server. When trying to access resources on any of the other servers, including the BDC, I get a path not found error. All the servers run NT4 Service Pack 6a. Is anyone aware of any issues affecting WinXP in an NT domain? Am I missing a setting somewhere on either the XP machine or the NT servers? Any input would be greatly appreciated.