Quote "" I have an HP Envy 17 which was purchased prior to October 2011 which means HP doesn't officially support Windows 8 on this device, and only provides driver updates for Radeon HD 6800M series on Windows 7 prior to Envy 17 models purchased before the October 2011 date (stupid, I know).""
If your computer manufacturer can't help you, why do you think AMD can? Read the sticky about Mobility Drivers.
Then buy a new computer....laptops go obsolete and there is nothing you can do about it.
Intel I7 960 @ 3.87ghz *Intel DX58SO *AMD R9 290 4gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit ** Toshiba P75-A7200 * Intel I7-4700MQ * Windows 8.1 64bit
***** cetera fallunt, ludere mortuus ******