My computer litterally has 0 kb's of space left, on the main drive that runs the computer as a whole, with it being full I can't watch Youtube, play WoW, get on MSN, the internet runs horrible, it just stops working (c drive) Is there a way, I can take the d drive harddrive I have, that has 300 gigs of space and make it the main drive? If not, how do I return the computer back to the way it was when it was factory made?