Double-click on the Prevent changing desktop background setting on your right-hand side. If it is set to Enabled, choose the Not Configured option and click the OK button.

Relatively simple ways to remove Windows 7's floating-color-balls start-screen animation, and supply your own background images for the operating system's log-on screen and desktop.

Double-click "Personalization," right-click "Prevent changing desktop background" and click "Edit." Click the "Enabled" radio button. Click "OK" to save the change and restart the computer.