Yesterday I read on a Battles.net forum that several people have the same problem like me and they have it also on the Diablo 3 game. There is a very specific fix from AMD for all HD3000 series cards except HD3870 which is my card! Yes I agree with the people here that told me this is a driver's problem. So I follow again the manual uninstall of my drivers, went to the site of my card's manufacturer which is PowerColor download the latest release of my card's drivers and the problem was FIXED. YEAH.