Here, this may help.
-Go the to the desktop.
-Right clik anywhere (not on an icon, but just an empty space)
-Click on "Personalize" located at the very bottom of the scroll box that appears. A seperate screen should pop up.
-From there, click on "Desktop Backgrounds" located in the bottom left corner. Above it should be an icon of your current desktop. Click this and change the desktop to whatever you would like!![]()