Whilst I think games are pointless and a total waste of time. I will suggest a couple of things.
I was thinking WoW was a windows architecture acronymn not World of Warcraft.
You never said where you got the drivers from. So, try downloading them from either AMD or HP, whichever you haven't tried before. But you will need your model number for that not just a series number!
But also what does setup.exe do in c:\AMD\Support\12-6-legacy.....
Also do a custom install and only select Catalyst to be installed nothing else.
Good luck.