thanks everybody for info. I'm tired to recover system everytime when I fail, so I have another question, is it possible to passthrought video card to virtual machine. I just installed vmware 9.0,Backtrack5 r3 64 bit already installed inside, but I have no idea yet how to transfer my video card there. As I thought, It would be only one card , ( no more optimus technology) running full mode with all nescessary software and drivers, performing higher pyrit benchmark rate. Does somebody knows is it possible to do so>?