Re: TS4_x64.exe error
@abigailannrobert TS4_x64.exe runs Sims 4, and it's within the game's installed files. Unless you changed the default install location in Origin, the full file path will be:
Program Files (x86)\Origin Games\The Sims 4\Game\Bin
One cause for this error is an antivirus program blocking the .exe, so please set exceptions in your antivirus for TS4_x64.exe and Origin.exe. If that doesn't help, let me know what program you use—some have additional features that can block the game as well.
You can also try turning down your UAC setting to the minimum, but this isn't a good long-term solution, since you do want to be notified when other programs try to make changes. Still, it's worth testing to see whether the UAC setting is in fact the problem. Please see this guide for more information on what each setting means for your computer:
https://www.tenforums.com/tutorials/3577-change-user-account-control-uac-settings-windows-10-a.html