@1fea007331bd471a Even though you're installing from disc, do you need to use Origin during the process? If so, Origin will update your game, but if not, please run the Super Patch before doing anything else. You can find it here, under "Cumulative Base Game Super Patcher":
https://forums.thesims.com/en_US/discussion/175477/official-ea-download-link-for-the-sims-3-cumulative-manual-update
This will ensure that your game is fully updated. The launcher doesn't always do a thorough job of patching on its own. And patching can undo any other changes you've made, including running the compatibility patch from Lazy Duchess.
The point of this thread is that Sims 3 and Sims Medieval don't start correctly on a family of processors that includes yours. This is likely DRM-related, but regardless, the workaround is to limit the game to using one of the processor's cores as it first starts loading. For Sims 3, you can run the patch made by Lazy Duchess, or the script from Miaa245, or you can limit the game to one core through the Task Manager. All the relevant information is in the accepted solution or in the posts linked there. But if you're struggling with a particular approach, please let me know which one you've chosen and what happens when you try it.
Please also keep in mind that if your disc install does NOT involve Origin, you need to apply the workaround of your choice to TS3W.exe, with the W, but if you are in fact launching from Origin, you need to use TS3.exe. (The PowerShell script applies to both.)
For Sims Medieval, you can use the Task Manager method as well, or you can modify the PowerShell script to reference the Medieval .exe rather than TS3 or TS3W.
For the script and the patch, the one-core limit is lifted long before it would cause any performance issues. For the Task Manager method, you'd need to do it yourself, as shown in the video.
