Lost Administrator privileges on single-user computer

While trying to download a program recommended by PC Magazine, I got an error
message related to UAC. I turned off UAC and it changed me from an
Administrator to a Standard User. I have not found a way to restore my
Administrator role. As a result, I can't use MSconfig, or System Restore, and
protected mode stays turned off.

I opened UAC but it won't let me turn on UAC or change back to an
Administrator. How do I fix this problem?

Thanks.

See if you can boot into Safe Mode and change your account type back to
administrator again. Afterwards, just restart the computer. These
tutorial will show you how if needed.

Safe Mode

Change Account Type

I had a virus or some kind of malware once that closed me out of all of my logs, my Control Panel and did simular things to the things you mentioned. I had Malwarebytes on my computer but I couldn't run that.

I started it in safe mode, ran the Malwarebytes and restarted it. It solved that problem. I'm no expert, but I hope this helps you.