[Samba] Unable to locate Domain Controller

[pkariuki at strathmore.ac.ke]

Hello,
Ive installed Samba 3 ... however, when I try to add a machine to the domain I
get the error that the domain controller cannot be contacted... I am able to
login through \\server\folder... however, when I try to add the same machine to
the domain, I get an error saying the domain controller cannot be contacted on
the windows machine ..(winxp...)... Any ideas?