How can I fix Cortana not running on Windows 10 build 10240?

[Windows Central Question]

Clicking on the Cortana box on the taskbar, as a tile on the Start menu or on the All Apps list doesn't do anything. Cortana isn't running at all in the task manager, any idea what's the problem?

 

[paschneid]

Same Prolem here.
Maybe the Problem is related to the newest nVidia Drivers?

I already try this command in the powershell console:

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