So I just had my computer reformatted and now my Fn keys do not work, the F1-12 keys combined with Fn (eVolume and such). I was looking around and found the conclusion that I do no have the essential preinstalled asus bundle of software; I found it here:
You probably need most of the drivers in the "utilities" tab. You can download them, extract the files since they are probably zipped and then install the drive by double clicking on the "setup.exe" program.
No need to follow the YouTube instructions. Since your problem has to do with missing drivers.