Windows Registry Editor Version 5.00

; Disable Windows Spotlight on Desktop
; Turns off the Windows Spotlight rotating desktop background feature.
;
; 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_CURRENT_USER\Software\Policies\Microsoft\Windows\CloudContent]
"DisableSpotlightCollectionOnDesktop"=dword:00000001