Failed to open the Group Policy Object on this computer

Situation: The client just removed a computer from the domain and he can’t run Group Policy Editor with this message: “Failed to open the Group Policy Object on this computer”.

Resolution 1: Update the group policy.

1. After the machine is dis-joined from the DC, login using the local administrator account.
2. Go to Start (open the Start menu) > Run (open the Run app), and type ‘cmd’ (without the quotes) and press Enter. [Or open the Start menu and then run the Command Prompt program.]
3. Type gpupdate /force /boot and press Enter.
4. Once it’s complete, reboot. The old group policy is gone.

Resolution 2: Open an elevated command prompt and type the following command:

secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose

Resolution 3: Reset all Local Group Policy settings to the default using Command Prompt

1. Open Start.
2. Search for Command Prompt, right-click the top result, and select the Run as administrator option.
3. Type the following command to reset all the Group Policy settings and press Enter:RD /S /Q "%WinDir%\System32\GroupPolicyUsers" && RD /S /Q "%WinDir%\System32\GroupPolicy"

Type the following command to update the changes in the Local Group Policy console and press Enter:

gpupdate /force

5. You should be able to open the Local Group Policy Editor.