Re: System Cannot Log You on Because "Domain" Is Not Available
This problem may occur if your user credentials have either expired or have been removed. Also check to make sure that user has permission to log on to that specific domain.
The general explanation usually is that the workstation cannot connect to the LAN (an ethernet cable could be unplugged; card malfunction, etc.) but you said you could access it locally from the administrator account, so it's probably just a permissions problem.