Cannot change registry permissions

I’m trying to delete the Display key in the registry as outlined here.
HowTo Switch monitor 1 Monitor 2 Identity | Overclockers Forums

I followed all the steps to change permissions & ran RegEdit as Administrator but had no success.

When I go to Advanced > Owner and select “Replace owner on subcontainers and objects” & click Apply, I get the following message:
““Registry Editor could not could not set owner on the key currently selected, or some of its subkeys.”

I click OK and proceed.

When I get to Advanced > Permissions and select “Replace all child object permissions with inheritable permissions from the object” & click Apply, I get the same message.

When I’m all done with trying to change permissions, I go back and right click on a key & try to delete it I get “Cannot delete DISPLAY: Error while deleting key.”. Which is what I got before I tried to change permissions.

I tried to delete just a single monitor and was successful so I figured that was the way to do it. But so far have not been able to duplicate that even though I tried many times. So I’m back to going nowhere.

Any suggestions on what I’m doing wrong?

I downloaded RegOwnershipEx & unzipped it but could not run it because there was no exe file. Turns out Norton removed it & said it was not safe. I can turn off Norton but figured I'd better ask first. Is that Winaero.com website the proper place to download the software from?

Also, I sent Pyprohly a PM and hopefully he'll respond.