How to turn off Cortana on a Windows 10 computer, so it doesn't take up power and can't hear or respond to your voice

You can turn off Cortana in Windows 10 through the Settings menu by taking away its ability to hear and respond to your voice ...
ExtremeTech

Cortana can't be disabled in the Windows 10 Anniversary Update

Microsoft won't let you disable Cortana in future versions of Windows. Post-Anniversary Update, Cortana and desktop search will be functionally identical. Share on Facebook (opens in a new window) ...