Windows 8 Metro Apps won't load

Try to run the App Troubleshooter:

http://go.microsoft.com/fwlink/p/?LinkId=271185

Also make sure that the registry/folder permissions are not changed:

Win8: App: Modern: Apps fail to start if default registry or file permissions modified https://support.microsoft.com/kb/2798317/en-us

I had the same problem, the apps opened for a moment then minimized and did not open.

I found that this command from MSDN Blogs, fixes the issue for each app. Just Change the name of the app you are trying to fix and done.

1. Open a elevated Command Prompt.

2. Execute the following command:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot******\AppxManifest.XML

Example: To solve problem with WinStore App:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.XML

To solve problem with Camera App:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\camera\AppxManifest.xml

To solve problem with FileManager App:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\FileManager\AppxManifest.xml

To solve problem with ImmersiveControlPanel App:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\ImmersiveControlPanel\AppxManifest.xml

Another fix is from Technet:

The following finally fixed all issues for me (Store and all apps broken):

A.) Fixing the app store: Run from admin command prompt:

Powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.xml

B.) Fixing all modern apps: Run from admin PowerShell:

((Get-ChildItem "HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\AppxAllUserStore\InboxApplications") | Get-ItemProperty).Path | Add-AppxPackage -Register -DisableDevelopmentMode

C.) Fixing 3rd party apps:

Delete the regkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\AppxAllUserStore[UserSID]

You can find your SID by going to an elevated command prompt and typing

wmic useraccount get name,sid