If you just want to change your desktop so that there's no wallpaper , then do this:
--> Right-click an empty spot on the desktop and choose "Personalize"
--> Click the "Desktop Background" link at the bottom of the window.
--> In the "Picture Locations" drop-down list, select "Solid Colors"
--> Click on the colour you want the desktop background to be (or use the "More..." link at the bottom)
--> Click the "Save Changes" button at the bottom of the window.
This is absolutely fabulous! Thank goodness this was presented to me before I lost my mind. :-) A