If Windows Store apps not opening in Windows 10, after you upgraded from Windows 8.1 / 7 then this post will show you how to fix the problem quickly.
You will have to re-register the Windows Store apps. To do this, type the following in a elevated PowerShell window and hit Enter:
Hope this helps.Code:Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
See this post if Windows Store itself is not working in Windows 10.