d0fdef48c2338f24 Did you make the new user account an admin account? It would start out without admin permissions by default, which would also prevent you from making some changes and might tighten the security for Windows Defender.
It's also worth repairing the game after changing Defender's settings. Doing so would put back any files that were quarantined and that the game might not be able to run without. And not only would you need to set an exception for TS3.exe, you'd need ones for Sims3Launcher.exe and EADesktop.exe as well.
If that's not the issue, we could continue to troubleshoot, but in all honesty, reinstalling Windows would likely be the fastest approach here as long as it's not too inconvenient. I will keep trying to help for as long as you like; I'm just saying you might find that reinstalling Windows is a better use of your time.
So I reinstalled my computer and the Sims - and I STILL get the same error message 😅
I don't know if I should laugh or cry at this point.
