Windows 8 comes with an AMD/ATI driver, but it fails at openGL. (Well, and at 3D too.)
So I wanted to install an official AMD driver, but it's not that simple.
AMD dropped the support for 2xxx/3xxx/4xxx cards since 12.6.
12.4 is not released for Windows 8.
12.8 comes with WDDM1.2, but as the support for my card is dropped, I have no chance to get it work.