Help Me Plz
Clearing the Store cache may be able to help with this.
Store Cache - Clear in Windows 8
Nope. You just missed part of the command at the end that was in the code box.
Code:powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.XML
For now, let's see if going through the list of troubleshooting steps below may be able to help.
Apps and Tiles Not Working or Responding: Fix in Windows 8