[Samba] pdc root password

[Mateus]

Hello,

i'm doing a PDC samba server. It's working fine, but i have a question.

When i configure winxp to enter in a domain, i need to put the root 
password, after reboot the machine, i  put the passwords that i created 
with smbpasswd, in this way works.

but i would not like to put the root password to enter in the domain. 
all the others passwords is wrong in this case. just the root works. how 
can i do this?