how to change lock screen wallpaper in windows 7 ultimate

How to change lock screen wallpaper on windows 7 #change_wallpaper important ( notes):- agar aap ko computer ya python aur C programming language ke upar video chaiye to comment kar skte hai,aur ha channel ko Like, comments aur subscribe karna mat bhole . ydi aap asi hi aur video chate ho. Thanks for watching this video. #rk_fortech #computer Deep verma