Re: SIMS 4 UPDATE BROKE GAME?
@Awsomepowers Thanks for the dxdiag, but I don't see anything definitive, just some errors from the Steam web helper that may or may not be relevant. (They're not typically associated with any Sims 4 issues.) But there are plenty of other possibilities. First, please try setting an exception in your antivirus software for TS4_DX9_x64.exe, the game's new executable as of this patch.
If that doesn't help, please create a new admin Windows account on your computer, as a test, and try playing there. The account needs to be local, as in, don't link it to your Microsoft account. Let me know whether you can play or see a different error.