permissions - Windows Update Properties - Access Denied (as Administrator)

I'm trying to set the startup type to Automatic in Windows Update Properties of Windows 10, but the error "Access denied" appears.
How can I fix it?

I tryed also with the command "Net user administrator /active:yes" in the Prompt; the administrator modality is activated, but I get the same error when I try to do the forementioned action.

Thank you in advance.