When the Windows PowerShell window opens copy the line below and paste it into the PowerShell window by simply right-clicking at the blinking PS C:\WINDOWS\system32> prompt, or by pressing [Ctrl] + [V] on the keyboard:

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