On school computers, I can log in with a user account stored on the school network (something like that, I have no experience in networking and this sort of stuff).

Everything is fine and dandy and totally works as it should, but there is one thing that I find annoying.

Apparently for some reason I can't change my background to anything more than a couple of different solid colors with our school's logo still stuck in the middle. (the original background is a white logo on black background. If I change it to a different color, the central 6x6 inch black/white logo still remains, only the surrounding color is changed.) It may have been set by school administrators or something, I don't really know.

I find this really ugly. Is there any way to change a setting so that I can set the background to any picture I wish? (like on a home pc...)

Thanks.