The domain has been downgraded from Microsoft® Windows® 2000 Server or newer to Microsoft® Windows NT® 4.0. This computer needs to be rejoined to the domain.
The domain of this computer, %1 has been downgraded from Windows 2000 or newer to Windows NT4 or older. The computer cannot function properly in this case for authentication purposes. This computer needs to rejoin the domain. The following error occurred:%n%2
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2008 and above
Microsoft Knowledge Base