Game won't launch/

OrionSkybourne1​  Please try playing in a new admin Windows account.  Make it local, as in, don't link it to your Microsoft account or any email address.  You'll be able to (try to) open Sims 4 without reinstalling anything, but your user data won't be available.  That's fine for the purposes of this test.

If this doesn't help, please let me know whether Sims 4 is currently installed on the internal or external drive, and if the latter, whether the external has any other data on it you wouldn't want to lose.