Hello, my name is Casey and I'm really bad at figuring out computers. I just got the inspiron 7437 literally today and I've already managed to screw it up. The function keys at the top of the keyboard are not doing what they are supposed to. I think I somehow disabled the functions that they did, like turn up the brightness and lower/mute the volume, but I don't know how to enable them again. I would very much like them back, so if you could help me that would be great.