that computer comes with windows 7 starter which does not allow you to change the desktop background out of the box. there is theme manager software that you can download to enable you to change the background though. one example is stardock my colors theme manager.
Member RevoMaxx is quickly moving up the ranks of Acer Community. He joined us in September and is already making a difference. It's great to see new members like him make a difference only after a few months. Thanks RevoMaxx!