After upgrading to Windows 10 , some people are facing issue of Settings app not launching. Or for some people when Settings is clicked, Store is getting launched. Microsoft has created a troubleshooter for the same.
Troubleshooter for this issue-
Microsoft has provided a troubleshooter for this issue and can be downloaded from here.
(downloads a 33 KB troubleshooting pack cabinet file named CSSEmerg67758.diagcab)
Once you click the link, when prompted click Run. Select Yes, if you get a Security prompt.
After the troubleshooter has run, search for Settings from the Start menu and launch the Settings app. That should fix the issue.
Yesterday Microsoft released KB3081424 Cumulative Update for Windows 10 and it includes the fix for the issue to prevent this problem from re-occurring. This KB doesn’t fix if one is already experiencing and has to run the troubleshooter only. And after that ensure this KB is installed.