So I downloaded Litestep and a theme I liked. Then, when I was about to install my theme, a box pops up that informs me of a few programs I have to download and install first. So I press the button download. Two of the programs couldn't be downloaded so a error shows up and after pressing OK, my backround is black and there is no "Start" menu or anything.
Is there anything I can do?

Found how I could reset it.