I don't have the answer. Just know that some of those customizers it's pretty easy to flip back and forth from original system files to the customized ones. Some it's more involved.
Have you done like Malwarebytes scans and that type of stuff? Might be a Registry hack attack or something. I had one on my Vista machine. Everything seemed normal except I couldn't delete any files in Explorer. I could delete using Del command in a command prompt. Turns out I got a Registry setting under Explorer not letting me delete anything. Malwarebytes scan picked it right off and fixed it.