hum... whenever windows loads up completely then have you ever press the "Fn" Button its located on the lower left corner and "F4" at the upper left corner? all of those number from F1 -> F12 with the Fn button pressed are Sub-Functions of the computer...
its very basic but i do not know your level of computer literacy so start by doing that if not you could find the driver at the ASUS home page; i hope this helps
Respectfully,
BlackAngelPR
PR Battle Field Bad Company 2 Team