AfterGlow HeadSet isn't working?

I'm using my universal wireless afterglow head set on my laptop(windows 7) and it won't play the sounds. Well i can hear Skype through them but YouTube, minecraft, flash games… Are playing through my actual computer speakers so i can hear them but not through my head set.

Look at the bottom right side of your desktop, find the sound symbol, right click it and view playback devices. Locate your headphones in there, right click it and set it as the default device. Apply and exit now try again.