@molliere If you use mods or custom content, please move the Mods folder to the desktop and try again. You don't need to save your progress; this is just for testing.
If that doesn't help, or you don't use mods or cc, please open Documents > Electronic Arts > The Sims 4 and delete any lastexception files you find. Try again to load your main household, still with no mods or cc, and see whether you get a new LE. If you do, open it, delete its first line, and attach it to a reply here.
If you don't get an LE, please try loading a new save. If that doesn't work either, please run a dxdiag and attach it to your reply.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/