Open the Interactive Desktop Calendar and select the "wallpaper" button.
Locate "change wallpaper" at the top of this section and click on the arrow pointing down.
Select an alternative wallpaper from the list that appears, or click "Get more wallpaper" to download another wallpaper pack.
Click on the wallpaper thumbnail that appears to set the wallpaper as your desktop background.
Click the Start menu and navigate to Settings > Control Panels
If you are using Classic View then double click on Display and select the Desktop tab. If you are using Category View (Windows XP) then click on Appearance and Themes and then select Change the Desktop Background.
Select "(None)" from the list