Download the tool called [win6x_registry_tweak][1]. Now open [a command prompt with admin rights in the folder][2] of the downloaded exe and run this command:

    install_wim_tweak.exe /o /c Microsoft-Windows-Cortana /r

This command removes the 3 cortana packages (Cortana main package, language pack and PAL package):

    Microsoft-Windows-Cortana-Package~31bf3856ad364e35~x86~de-DE~10.0.10240.16384
    Microsoft-Windows-Cortana-Package~31bf3856ad364e35~x86~~10.0.10240.16384
    Microsoft-Windows-Cortana-PAL-Desktop-Package~31bf3856ad364e35~x86~~10.0.10240.16384

After a reboot your Windows is cortana free.


**ATTENTION. Make a full backup if you later when to restore it to get Cortana back. If you have not done any backup, use [those steps to generate the CABs for your Build][3]. Replace Flash with the MUM names of the Cortana packages. You need to generate CABs for all Cortana MUM files like here the x86 MUMs for Build 14393 [![enter image description here][4]][4].**


  [1]: http://www.msfn.org/board/topic/152688-win6x-registry-tweak/
  [2]: http://superuser.com/a/1067983/174557
  [3]: http://superuser.com/a/1171910/174557
  [4]: https://i.sstatic.net/6R7y0.png