Every time I press the Enter key, a Control Panel window opens to the Edit Plan Settings menu. For reference, I am running Windows 7 (64 bit).
Why is the Power Options menu opening every time I press Enter?
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You most likely opened the Windows Mobility Center on accident with ⊞ Win+X.
The Enter key will open the Power Options menu while the Mobility Center window is focused. The key should function normally after closing the window.
To clarify, pressing ⊞ Win+X will only open the Mobility Center on Windows 7. The shortcut was changed in Windows 8 and 10 to open the Power User Menu instead.
If using a different keyboard (or on-screen keyboard doesn't work, and Windows Key + X doesn't work, nothing works, then try this:
Open task manager (CTRL + ALT + DEL) then find 'explorer.exe', click on it, and click restart.
This fixed it for me without having to restart my computer or system restore.