This is a handy tip for those with a netbook running Windows 7 starter

[udtrev]

Micro$oft, in their infinite lack of wisdom deemed that in Windows 7 starter you cannot change the background image.

If you follow this link and download Oceanis Change Background Windows 7 you can get round that restriction http://www.sevenforums.com/tutorials/47294-desktop-background-change-windows-7-starter.html