2 weeks ago
@0213962012 Look, I know you want to play with your added content, but from your description, it seems overwhelmingly likely that some of that content is the issue, not Origin, not the game's program files, and probably not your computer. Did any of the suggestions I posted yesterday help? Sorting through your custom content, or rebuilding it from scratch, are probably the only ways to fix the issue.
@Diamond19Girl Please post a screenshot of the error code.
@Diamond19Girl You need to download and install .NET Framework 3.5, as the message says. Sims 3 won't work without it. The framework is made by Microsoft, and Windows will find and install the correct version, so there's no harm in downloading it.
If you keep getting the same error message even after installing, please run the .NET Framework repair tool, also made by Microsoft.
Once you've run it, restart your computer before trying to play.