Have you installed WINS? These search results may help,
Domain FAQs
Can't join or logon domain Can't join or logon domain - case study
Can't join or logon NT Domain Can't join XP clients to a NT domain ...
http://www.chicagotech.net/domainfaqs.htm -
logon domain issues
Can't logon NT domain - "Windows cannot connect to the domain".
Symptoms: After you join a Windows XP client to a Windows NT domain, the
client may be ...
http://www.chicagotech.net/logondomain.htm
--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
"duddins" <duddins@discussions.microsoft.com> wrote in message
news:6BEAC713-82B6-41C3-8D15-117793CB713B@microsoft.com...
> Hi, I ve just purchase New PC came with Windows Vista ultimate. I been
> trying
> to join my existing Nt4 Domain but it keep on appearing " the following
> error
> occured trying to join the domain "Distiqamah"
> Logon' failure unknown user and password'
> been trying several user name and password but still unsuccessful.
>
> My other 2 setup for Windows Vista Buisness version were successful.
>