Connected an old keyboard to my PC which changed some Windows settings
I then reconnected my keyboard that I normally use but the Windows settings (Appearance) didn't change back. I tried system restore, that didn't change them back either. I manually changed back the ones I knew how like theme but when I restart or even just logout and back into my account, I see that the settings didn't save. I activated a guest account which I then logged into, and the Windows appearance settings were fine on it.
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Connecting a keyboard has absolutely nothing to do with Windows themes.