I'm very sorry to hear about this. In order for me to help you most accurately, please provide the complete model code for this device. Also, could you let me know what things you've done to try to fix this? Things like making sure that all your drivers are up to date with SW Update and any Windows updates are installed.
I bought my laptop last year and have been unable to figure out how to disable the auto dim feature which darkens my screen whenever I play The Sims 3. I'll start playing the game and within about 30 seconds the screen goes so dark I cannot see a thing. Adjusting the brightness settings under the control panel or Fn + F3 doesn't do anything to fix this. It's so frustrating that I don't play my game and kind of resent that I bought this machine.