Dell laptop freezing and playing a gunfire sound

I have had this problem for a long time already and it started with League of Legends it started around 6 months ago and would be infrequent and my computer would recover from freezing for a moment but other times it would keep freezing play a machinegun sounding sound (like it is looping a really tiny fragment of sound really fast. Since 3 weeks this problem has spread to other games which never had teh problems before like skyrim and Dota 2. I have recently found out that my computer actually is making a report of this happening so I screen shotted it.

http://imgur.com/OahI37s/

Could anybody help me fix or at least identify this problem. Thank you.