That's not entirely true,, and this may be a band-aid,,, but not a resolution to this issue.
Yes, You can edit the registry from you Account that is Admin.
You do not need to enable the (so called) Super Admin account.
Either the User you are logging in with is not an Admin, or it is Corrupt, or there is another problem.
Your first solution should be.... create a
New User with Admin rights.
logon with that user and try editing the registry again.
If that works, then either the other user is not an admin, or the profile is corrupt.
If it doesn't work, then you need to try
sfc /scannow
If that doesn't work, then personally, I would suggest backup data, NuKe and Reload the OS.
If rights or womething else to Regedit are broken, there is no telling what else might be,, safe to start over than try to patch and fix repeatedly.