[Samba] samba pdc authentication problem

[abs pathak]

I set up my debian machine as a samba pdc.  I added root as a samba
user.  In the smb.conf I added the "domain admin group = @wheel" and
"domain admin user = root".  The only discreptancy I can see is that I
don't have the group wheel.  I tried setting that to root but when I
try to add my winxp machine to the domain I get an error saying user
root not found.  Can someone please point me in the right direction?