“Unable to shutdown system “Error - You don't have permission to shut-down this computer

Possible cause: 

This could be caused by ‘User Account Control’.

There are distinct policies governing ‘UAC’ behavior, one for built-in Administrator account while another is for all other administrative users.

By default, built-in Administrator account is not affected by ‘UAC’, while all other administrative users are; thus, it's possible for an administrative user (different from the built-it Administrator) to not get administrative rights, even if it's a member of Administrator’s group.

Steps to resolve:

        1. Press “Windows+R” together and it will open run window.

        2. Type “gpedit.msc” and click ‘OK’

        3. Navigate below settings.

Computer Configuration --> Windows Settings --> Security Settings --> Local Policies --> Security Options

        4. In right side pane, find out below option.

User Account Control: Run all administrators in Admin Approval Mode (select ‘Enable’ & click ‘OK’ to apply changes)

*In order to implement change, system restart is mandatory.

*To restart the system Press “windows+r” together and type “shutdown -r”.

*Quick Heal at this point are not confirmed of the exact cause leading to this behavior. For the reported cases, following the above steps should help resolving the issue.

Thank you.

Team Quick Heal