The sims 4 loading screen

@sillyislex  Please move your entire Sims 4 game folder out of Documents\Electronic Arts and onto your desktop.  When you launch the game, a clean folder will be created with no content.  If you can start a new save and play it for a bit, then the issue is something in your old folder, and you'll need to sort through those files to find out which is/are corrupt.  Start with your mods and custom content, if you have any.  If you'd like help with this process, let me know.

If the game won't load even with a clean folder in place, please run a dxdiag and attach it to a post.

https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/