Re: Sims 3 won't load on EA app, unable to uninstall either
@shurumushurumu I'd suggest reinstalling Origin, at least for now. You can download it from here:
It's fine to have both Origin and the EA App installed on the same computer; you just can't run them both at the same time. If you get an error when trying to install or open Origin, restart your computer, or open the Task Manager and kill the EABackgroundService.exe.
If Origin thinks Sims 3 is still installed, you can run a game repair, which should put back any missing files. It's not as clean as uninstalling and reinstalling the entire game, but it might be good enough, and if not, Origin should allow you to uninstall fully.
The "no packages to install" error is a known issue with a partial workaround; please see page two of this thread:
If the world your save takes place in is not loading properly, then the "serious error" is a common result. This can also happen if you try to load a save while an expansion it uses is no longer present, for example if the EA App decides not to load all of your packs. So while this is a frustrating outcome, it's more a symptom than a separate problem. If and when you get all your packs and store stuff installed and loading, please test the save again and let me know whether it loads properly.