Controls light Stopped Working - dm4

Control keys for brightness (f2 and f3) on my Pavilion dm4 stopped working all of a sudden. I am windows 7 64 bit OS. I tried to go back to previous system restore points. I also installed the BIOS, Intel chipset and graphics drivers. All the other function keys work correctly, just cannot change the brightness. At the moment he is stuck on the intensity setting.

I hope someone can point me in the right direction to solve this problem, I'm terrible eye strain of the screen.

Thank you

@Rico, I found out how to fix it... trial and error... go to Device Manager and click your graphic driver... and uninstall IT... computer restarting... If you have win 7 it should install the grappics driver automatically updated... Otherwise, return to the Manager of devices... and go to the new device that is not installed... update... and restart the computer... then brightness controls won't work... Sorry if I rushed through guidelines... reply back if you need more specific onees

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