I have AMD radeon HD 6900 series graphics card and dirextx 11 is installed on my computer, when i checked it from "dxdiag". But when i'm trying to launch Lara Croft and the Temple of Osiris it gives error "this game requires a direct x 11 capable graphics card. your card or driver does not support DirectX11. Where is the problem? i already ahve the DirectX11 installed.