I deleted trustedinstaller, how to fix it?

[Silly guy]

So I deleted trustedinstaller, I wanted to get an earlier version of windows media player, But for that I needed to delete the one I have, it was protected with trustedinstaller so I deleted the thing self, only now I heard it might break the computer, I didn't see yet what it did, but I think it's bad, my PC is currently turned off, can I fix or reinstall trustedinstaller in any way?

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