[Current Issue] Sims 3 "serious error" when loading save

AshtenKay​ Ebrown33playa​ absgax​  I've merged your posts with the master thread for the "serious error" issue.  Please see the first post for further help.  That includes confirming that your Documents directory is NOT in the OneDrive folder, which means running the reg query command listed in the first post and viewing the result.

If your Documents directory is not in OneDrive, try a new, local admin Windows account, as described.