The f1 key settings on a hp windows 7 lap top

Hello,

i just currently bought a new lap top and say im in a game as such and go to use the f1 f2 f3 f4 keys etc instead of it useing the game function it brings me back to the desktop is there any way u can change your keybord settings or turn off the keys so i can continue playing or running programs without this happening all help would be great thanks
(f1= help) (f2=dim screan) f3 = brighter screan) f5= skip chapter (f6= play or pause )