If I were still preparing to take the GRE, I would start by purchasing study guides from a company that seems to have a grasp of basic logic. That company would not be Kaplan. See, Kaplan assumes that none of their customers are using Windows Vista. You know, the latest commercial release of the world’s dominant home computer operating system. At least, that would explain why their practice test software doesn’t work on computers running Vista, and their tech support staff don’t seem terribly concerned.