[Samba] help.. please.. help!!!

[Social Demo]

hi , sorry if I bother you ,but I need  your help urgently.... I am installing ubuntu with samba as PDC... but I cant make it.... could you give me some manual or any documentation about this... I already follow the documentation but when im trying to join a winxp or win7... They can not join to the domain.  something about SRV error .. 
please,.... i really need your help

best regards.

carlos

from - Colombia