In Windows 8 or 8.1, PC Settings may not start: clicking on it very briefly shows the purple background but then returns to the desktop or start screen. The Application event log shows the following error (or a similar one):
A possible solution is to re-register the PC Settings app (also known as Immersive Control Panel) through Powershell. Run the following from an elevated command prompt:
powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRootImmersiveControlPanelAppxManifest.xml
This re-registers PC Settings on your computer, allowing you to start it again.
This problem can also occur with the Windows Store app. See this article to solve.