Win 2K pc only letting 1 user log on

We have a Win 2K pc that logs onto our domain perfectly fine for years, recently with the addition of new users we tried to log these new users it refuses with the error that "the domain is unavailable" instantly.
Unable to create new users locally or for teh domain due to "trust error"
Am unable to complete the Network ID wizard with any other user due to "trust errors"
Can not log in as Administrator of domain.

i know its not a DNS error because when that user logs in, everything works with no errors.

Any ideas?
Who is Participating?
Hi total123,

run netdiag on the server and post its failings here

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