I want to know if "Microsoft Windows XP Home Edition UPGRADE with SP2" CD is just upgrade to an existing XP home install or XP full install with SP2? The CD box has even the product key. The reason I'm trying to figure out is I just purchased a new motherboard and my old XP CD gives a blue screen with Stop error when I try to install it. I called the motherboard support and was told that its compatible only with XP w/SP2 at least. My old XP CD doesn't have SP2.