These are the packages I'm talking about: Have you tried the newest Intel and AMD packages for your desktop? I've recently checked the available downloads for your XPS 8500 and found that there are all the needed drivers for Windows 8.1! Just grab the 'Intel Integrated GFX Driver' and the 'AMD AREV Driver for Windows 7, 8 & 8.1 64bit Operating Systems', and then perform an installation in a usual way (Intel's first, next an AMD's one).
