@adancingirl Please do all of this, together, before playing again:
- Clear Origin's cache
- Repair the game: open your Origin game library, right-click on the Sims 4 icon, and select Repair
- Move the Sims 4 folder out of Documents\Electronic Arts and onto your desktop (again)
- Restart your computer
Let me know whether the game launches. If it doesn't, create a new admin Windows account and try to play in that. Make it a local account, as in, don't sign into Microsoft, and don't sync with any other services you normally use. You'll be able to sign into Origin and won't need to redownload anything, but your saves and other content won't be available. That can be addressed later; for now, just see whether you can get far enough to start a new save.