I write this post to say: DON'T install beta drivers 337.50! Yesterday seems works all great (i play Persona 3 FES all day on pcsx2)...Today i turn on the PC and the drivers are broken!
3D acceleration off and video adapter reverted to windows 8.1 default drivers (software mode i suppose) are really a pain in the *** !!! now downloading standard drivers 335.23 and uninstall of beta drivers....

