ideapad and windows 8

hello

I have a Lenovo ideapad z570 i7 cpu that comes with preinstalled windows 7 which had Lenovo programs and drivers : power management...etc.

I have recently installed windows 8 pro 64 bit and I didn't face any problems installing it the problem is the hotkeys aren't working example fn + f5 it should activate wireless lan but nothing happen + the blutooth adapter isn't detected.
only sound keys are working.

thanks. :)