When the trust relationship between a workstation and domain has broken down how can you fix?
Remove the workstation from the domain then rejoin the
workstation to the domain.
...if you want to run the risk of losing some security
credentials. When you leave and rejoin the domain you are no longer
in the same machine account. The simple fix is to log in as a local
admin and from the command prompt type:
netdom.exe resetpwd /s:<x.x.x.x> /ud:<AccountName>
/:pd*
Where <x.x.x.x> is address of a domain controller and
<AccountName> is a domain account.
You will be prompted for the password for the account you used
and 2 seconds later the job is done. You do not need to reboot just
log off your local admin and carry on. Your machine password will
have been reset and trust restored.