Sims 4 won't launch (EA APP)

@RunaYomozuki928  Please set the EA App to NOT start with Windows.  The option should be under Settings > Application.

When you're done using the App but don't plan on shutting down your computer, open the Task Manager and kill the EABackgroundProcess.  This shouldn't be open if you haven't launched the EA App since the last time you restarted your computer (as long as the App isn't starting with Windows), but it won't close when you quit the App itself.  Alternately, you can kill the process before opening the App again.