GAME CRASH

@Rorysims  Thanks for the dxdiag, which lists one crash of Sims 4 that's actually related to the AMD graphics driver.  So please force the game to use the Nvidia card instead.  Open Windows Settings > System > Display > Graphics settings, click Browse, find TS4_DX9_x64.exe (for DirectX 9) or TS4_x64.exe (DX11) on the list, and choose the high-performance option.  You can set this for both executables if you want to switch between DX9 and 11.

If that doesn't help, 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, 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 either, please let me know whether you're using DirectX 9 or 11.  Please also look for new errors in the Reliability Monitor.  Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day.  Today is on the right.

Look for an error that happened at exactly the time of your most recent attempt to launch Sims 4, specifically using the clean folder.  If you find one, double-click it to see more details, then copy that info and paste it into a reply here.  If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.