Re: Game crashes when changing from fullscreen to windowed fullscreen

@megancookd  Are you getting BlueScreens when you play Sims 4, and if not, when do they happen?  They're definitely happening—I see several in your dxdiag.

Your C drive is also very low on space.  Since your F drive is also an SSD, one in the same performance category, this would be a good time to move whatever you can to F.  Let me know if you need help with this process.

Here's how to switch between DX9 and 11 modes:

https://answers.ea.com/t5/PC/Enabling-DirectX-11-For-Sims-4-on-EA-app-and-Steam/td-p/13711976

For the Sims 4 issue, are you playing with OBS running in the background?  If so, please disable it, and make sure it's not running in the Task Manager, even in the background processes list.

If that doesn't help, please try playing in a clean boot:

https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd

The one service to leave enabled is the EABackgroundService, which the EA App needs in order to run.  Disable the rest as described.

When you reboot your computer, go through the Task Manager's background processes list shutting down any service that doesn't absolutely need to be running, for example anything from MSI Afterburner to RGB software might still be enabled.  If you accidentally kill a critical process and it doesn't restart on its own, just reboot your computer again.

Don't open anything other than Sims 4 and the EA App while testing, not even a browser window.