@CopperBruiser788 I think it's more likely that the problem is your save, not your computer. I can take a look at a dxdiag if you want; just run one and attach it to a reply here.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/
There's also one more approach you can try. Create a new save in the same world as your current one, save your progress, and quit. Open the Saves folder, then the folder for your new save, and delete the .nhd file. Copy the .nhd file from your affected save into the new save's folder and see whether the new save now loads. If it does, you'll actually load your old save, just with (temporary) metadata from your new one.
Saves can sometimes get corrupted, and it's more common when not using the standard NRaas mods that help game performance. Unfortunately, by the time the save won't load at all, it's usually too late to do anything about the problem. This is why it's critical to keep backups, not just the one the game makes but your own that you create as you play. The simplest way is to use "save as" to rename the save: the original will remain intact under its old name.
If you'd like to know more about the mods that can help protect saves from corruption, please start here:
https://answers.ea.com/t5/Technical-Issues-PC/Sims-3-Common-Game-Fixing-Mods-Hero-Approved/m-p/9838855#M244208
The error from the EA App about being offline is normal when a game crashes. It's not the cause of the crash, just a quirk of the App itself.
@ixiexz Please try to load your save without your custom content and without any mods except those from NRaas, if you use them. You don't need to save your progress; this is just for testing.