Reset GPO

To clear Local GPO

Delete everything inside the GPO folder

RD /S /Q "%WinDir%\System32\GroupPolicyUsers" && RD /S /Q "%WinDir%\System32\GroupPolicy"

To clear Domain GPO

Make a backup of the GPO in the domain first.

To reset the Default Domain Controller Policy:

dcgpofix /ignoreschema /target:DC

To reset the Default Domain Policy:

dcgpofix /ignoreschema /target:Domain