5: Choose Windows Right-click on it and then Click new then Key and name it Windows Search.
6: Right-click on Windows Search and then key and then DWORD (32-bit Value)
7: Make the DWORD value, and its value must be Zero.
8: Now You have to reset your pc so see changes in Cortana.
After restarting your computer, the Cortana will go, and window search bar will be there in place of Cortana. Therefore our issue is resolved, and the data which Cortana was saving will be safe. You may find that Cortana is running somewhere in the background. Windows have some restriction on killing the Cortana, but we have disabled the Cortana successfully. The main reasons are, this may happen when you install updates of Windows 10. The Cortana will restore so you have to remember the method so you can disable Cortana windows 10 again.
At last, What is the Conclusion about Disable Cortana Windows 10:
What we have learned in this article is that What Cortana is, how does it work and how to disable Cortana Windows 10. What I will suggest you is that to follow these steps and disable Cortana windows 10 from your PC. Also, free from artificial systems which store your information and used it again and again for other purposes.