When you see the notice
"This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator."
or similar wording to that effect, it usually means that the action you wish to take is controlled by a group policy. If you have the Professional edition of Windows 10, and access to a user account with Administrator permissions, you can use the Group Policy Editor to remove the 'restrictions in effect.' If that's what you'd like to try, I'll certainly show you how its done.
In general, when you are working through a computer problem, 'going through regedit and deleting files that aren't needed' is the wrong approach, and could have far-reaching consequences. The better way is to try to understand what's going on. Only then can you come up with an appropriate - and safe - solution.
Also, if you're wondering "who the heck is my system administrator," I can explain that too.