I am dealing with the same problem. I suspect the root cause was IOBIT Advanced System Care, because the problem occurred on my laptop as well. I RESTORED the laptop, and that is working normally. My main computer is an HP Pavilion Elite. I mostly work in standard mode, so I did not notice the Metro tiles stopped working until I attempted to open STORE. When I did, the screen turned green, the STORE icon appeared momentarily, and then the standard desktop screen returned.
I ran the following commands as Administrator in Command Prompt:
1. Dism /Online /Cleanup-Image /RestoreHealth
2. SFC /SCANNOW
3. powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.XML
The response from the first command was that a corrupted file was identified and fixed. The second command completed without an error message and the third simply executed without providing any response.
I also checked the registry to ensure that SYSTEM owned: "HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages"
I then ran the Microsoft Windows Store Apps tool and received a pop-up stating the display adapter drivers might be out of date. (I updated the driver from Device Manager, rand the Apps Tool again, and received the same notice.)
The Windows Store Apps tool reported back: Problems Found
Check for missing or corrupt files - Detected
Display adapter drivers may be out of date - Detected
Service registration is missing or corrupt - Fixed
I ran the tool again and received the same error.
None of these steps corrected the problem. I would appreciate help.