I can't run The Sims 3. He wants to download Origin, even though I have downloaded it
@kurovice That often happens with mismatched registry entries, so you'll need to uninstall Sims 3, clean your computer's registry, and reinstall. If you're not comfortable editing the registry yourself—removing the wrong entry can prevent your computer from working properly—you can use a tool like Piriform's CCleaner (the free version is fine).
@kurovice Have you registered your copy of Sims 3 in Origin, and can you just download it from your game library? That's a simpler approach than installing via disc.
@kurovice That often happens with mismatched registry entries, so you'll need to uninstall Sims 3, clean your computer's registry, and reinstall. If you're not comfortable editing the registry yourself—removing the wrong entry can prevent your computer from working properly—you can use a tool like Piriform's CCleaner (the free version is fine).
