Re: Sims 4 not launching
@12242212 If you haven't restarted your computer—a real restart, not sleep and wake or even a shutdown and reboot—please do that first. If that doesn't help, please uninstall the EA App with Revo Uninstaller (the free version is fine), download a fresh copy of the installer, and use that to reinstall. Run both Steam and the EA App as an admin before trying to launch Sims 4.
It's also worth repairing the game in Steam. Open your game library, right-click the Sims 4 tile, and select Properties > Local files > Verify integrity of the game files.