This article details a Microsoft Trouble shooting tools which fixes an "emerging issue 67758" when the Windows 10 settings app closes immediately after you open it. Worked for me!
Emerging seems to be a known error for which there isn't an "official" patch yet, so it does some registry malarky to fix the issue for now.
I wonder if I'll need to run ut again?
Fix: Windows 10 Settings app does not open or launch:
'via Blog this'