How to Reset Group Policy Settings
Group Policy is a set of rules that define what users can and can't do on a system. Group Policy settings are normally permissive, but can be used to restrict a system for public or select usage scenarios. Group policy can be accidentally set to be overly restrictive, preventing legitimate use of the system. You can reset Group Policy using a command-line instruction on the machine's default "Administrator" account.
Log into the system using the username "Administrator" and the administrative password.
Press the "Windows" and "R" keys together to open a "Run.." dialogue, then enter "%SystemRoot%\System32\" and press "Enter."
Scroll down to "GroupPolicy," then right-click it and click "Delete." Click "Yes" to confirm the action.
Open the Run menu and type "cmd" then press "Enter."
Type "gpupdate /Force" and press "Enter." All current Group Policy settings will be reset to the system default.