Alienware Function Keys(Specifically FN+F7 and FN+F8)

I was getting rid of some unnecessary start up programs the other day on my M14x and turned off something that made the volume shortcuts on my keyboard stop working (FN+F7 and FN+F8). I can still use all the other FN shortcuts, only the volume control buttons don't work.(No icon shows up when I change the brightness anymore though). I tried searching for a way to fix this issue for about a week now and even tried to go back and turn on all my startup programs again, but so far nothing has worked. Any help would be appreciated, thanks.