I made a big mistake with Task Manager

Hi guys.

I was trying to free up RAM so I could play a game so I was ending unnecessary processes, and after I ended what I think was something about Cortana Search the screen went black. It might have been Mozilla Firefox, though. However, notifications still pop up and programs still run and work properly but the toolbar and the desktop/background are COMPLETELY GONE. The "run" shortcut won't work, but Task Manager will and I can still use the "new task" option, and it works. Any help would be appreciated. And, yes, I know, I made a stupid mistake.

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Never mind, I signed out with ctrl+alt+del then signed back in and everything is back to normal. And I promise I will never do that again.

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