Tavetta

Edition? I just got a new laptop that came with Windows 7 Starter and I can't figure out how to change the background! Is this just a stupid thing that doesn't come with a starter edition? Do I have to upgrade to get the ability to change backgrounds? I've never had a computer that does this before, and I feel a little ripped off! Its a really really basic feature, and they just want you to spend more money by upgrading! GRRRRRR! I'm not gonna upgrade just for that, but if you know how to do it without upgrading, plz tell me!
Thx! :P