1. Right click on the Start Menu button -> Search -> Windows PowerShell -> Run As administrator
2. Paste the following command into PowerShell and execute it:
3. Reboot

Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

reboot /r /t 0

Source: answers.microsoft.com