Re: Sims 3
@misjean92 When uninstalling, it's necessary to clean your computer's registry before trying to reinstall. You can clean the registry manually, or with a tool like Piriform's CCleaner (free download). Otherwise, those leftover entries can prevent you from installing or launching the game going forward, as you're seeing now. It may also help to clear Origin's cache before reinstalling.
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
Originally, the issue was probably that your save had become corrupted, or maybe you had a corrupt file in your game folder in Documents. There was nothing wrong with your program files, and no reason to uninstall. Compatibility mode was and is unnecessary as well—TS3 runs just fine in Windows 10.