Disable Cortana (Registry Tweak)

Windows Registry Editor Version 5.00

; Disable Cortana
; Disables Cortana integration in Windows Search (requires admin). Requires an elevated (Administrator) prompt.
;
; Usage: double-click to apply, then sign out and back in (or restart
; explorer.exe) for it to take full effect. Back up your registry first
; if you're unsure (File > Export in Registry Editor).

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Windows Search]
"AllowCortana"=dword:00000000