tiffannnyy One common reason the Sims 3 launcher doesn't even open is an issue with .NET Framework 3.5, which the game and launcher use. I explained how to uninstall and reinstall it in another recent post:
The Sims 3 won't launch on EA App - returns to launcher (May 2026) | EA Forums - 13422440
If that doesn't help, please provide a dxdiag. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.