After applying a Windows Update, you are unable to logon to your domain.
If you try to join a workgroup, you receive:
The Revision Level is Unknown.
To workaround this behavior:
01. Log on locally with Administrator privileges.
02. Use the registry Editor to grant the your account Full Control of the HKEY_LOCAL_MACHINE\SECURITY\Policy\Secrets\$MACHINE.ACC registry key.
03. Delete the HKEY_LOCAL_MACHINE\SECURITY\Policy\Secrets\$MACHINE.ACC registry key.
04. Shutdown and restart your computer.
05. Log on locally with Administrator privileges.
06. Join a WORKGROUP and restart your computer.
07. Log on locally with Administrator privileges.
08. Join your domain.
09. Shutdown and restart your computer.
10. Logon to your domain.