Sims 4 not launching properly in EA/Steam

@Le_Neef_  As a test, please try playing in a clean user folder.  Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, if it launches, a clean folder will spawn with no content.  (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.)  Don't add anything to the new folder yet; just let me know whether you can get far enough to start a new save and play in live mode for a bit.

If that doesn't help, try launching the game in windowed mode.  Go into Documents > Electronic Arts > The Sims 4, open options.ini, search for fullscreen , and set it to 0 (zero).  If this works, you can go back to fullscreen mode, but at the same time, set the in-game resolution to whatever your monitor uses.

If that doesn't help either, please run a dxdiag and attach it to a post.

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

Thanks for the answer! So I tried the clean user folder and it didnt work. Eventually had someone else look at it and we somehow got there via unintalling reinstalling deleting all files etc. He reckons there was some config conflict. One curious thing was when unintalling from steam and then trying to delete the Sims folder from steam specifically, it wouldn't let me as I needed to be an 'admin' As the sole user on PC I already am so that was a bit weird. The issue happened again today unepxetedly, I followed what you said re changing from fullscreen and it seems to be working fine again. My screens are a 24 and 28inch so I think something with that was messing it all up? Hopefully its smooth sailing from now but if not I may come back to you if thats ok?

Thanks!

@Le_Neef_  The physical size of the screen shouldn't matter at all.  What can matter is the resolution of each screen, particularly if the two are different or use an uncommon aspect ratio.  Playing in windowed mode takes screen resolution out of the equation entirely as long as the game window is smaller, in terms of resolution, than the screens themselves.

For deleting the Steam folder, it would have been better to uninstall through Steam rather than manually deleting anything.  The message about needing admin permissions is typical for certain protected folders, for example on one computer, I see it when deleting files from Program Files but not Program Files (x86).  It's nothing to worry about on its own; just click Yes or OK to grant permissions to delete the folder, or restart your computer and try again.  Or, as mentioned, uninstall the normal way rather than manually deleting folders.