The trust relationship between this workstation and the primary domain failed

I was wondering why this message sometimes appears in a huge organization.
Today I found one of the possible reasons.

This happens when you join computer into the domain with a name which already exists.
You are supposed to receive a message about the duplicate computer on the network but you don't. So the new computer replaces the old one and the old one are no longer valid.

To solve this situation you have to delete computer object from active directory and log into this computer with locol acount (not domain).

If recieve this message:

Your account has been disabled. Please see your system administrator.

Then insert Hirens Boot CD and select "Offline NT/2000/XP/Vista/7 Password Changer":

Select disk where windows installation is:

Select path and registry files:

Select password reset:

Enable and clear local administrator account:

Save changes to disk: