Computer volume going maximum when changing volume

[RoadToZion]

I was lowering or raising the volume for a bit while playing Red Alert when all of a sudden, my computer's volume goes straight to maximum level that I immediately had to mute the volume through my keyboard (Yes, my keyboard has a mute volume key) and exit the game to lower it.

How am I controlling the volume? Well, I am controlling my computer's volume using the keys from my keyboard (F11 for lowering and F12 for raising).