Windows XP & Samba

[Mark]

I am trying to make my windows XP (the new version, due for release in june)
box join my SAMBA domain.   It acts just like Win2K in regards to networking
(I think), but when I try to join the domain, i get the message 'Access is
denied' on the Windows box, and in my smbd.log i get (I think this is the
relavent bit):

2001/03/18 09:29:50, 3] rpc_server/srv_pipe.c:api_rpcTNP(1179)
  api_rpcTNP: rpc command: SAMR_SET_USERINFO
[2001/03/18 09:29:50, 2] rpc_parse/parse_samr.c:samr_io_userinfo_ctr(5825)
  samr_io_userinfo_ctr: unknown switch level 0x1a
[2001/03/18 09:29:50, 0] rpc_server/srv_samr.c:api_samr_set_userinfo(672)
  api_samr_set_userinfo: Unable to unmarshall SAMR_Q_SET_USERINFO.
[2001/03/18 09:29:50, 0] rpc_server/srv_pipe.c:api_rpcTNP(1199)
  api_rpcTNP: api_samr_rpc: SAMR_SET_USERINFO failed.


I have added root to the smbpasswd file, and so think this should work.  Any
ideas?