I hope the suggestions above worked for you, because they did not for me. If all the above did not work for you, And your Enter Key is opening up Power Options, Check if your Windows Mobility Centre is open. You might have opened it with the shortcut ”Win + X”. The Enter key will not work especially if the keyboard cursor is focused on the Power Options in there. So, CLOSE the Windows Mobility Centre window. That should work. If that still doesn’t work, Open Task Manager and find the EXPLORER.EXE task under the Processes Tab. Right-click it and click on Restart. That should do a mini software reboot on your system (Without actually switching off your system). That, then, should work. If this helped you, indicate and upvote that it did. So others too can find this when they need it.