Re: Can't create or load saves, "Serious error"
@hugsohugs A dxdiag is always appreciated since it covers a few of the questions I'd ask right away. But in this case, my other questions are what antivirus you use and if OneDrive is running (whether you use it at all or not).
Please also let me know what happens if you play in a clean user folder. Move the entire Sims 3 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, a clean folder will spawn with no content. Don't add anything to this folder; just try to start a new save in Sunset Valley and let me know whether it works, both in loading and in saving. You don't need to spend much time on it since this is just for testing purposes.
Please let me know if you get an error when trying to move the Sims 3 folder or if it copies rather than moving.