The bugcheck you posted shows audiodg.exe
Try reading this article by Microsoft here: A memory leak issue occurs in the Audiodg.exe process when you play audio on a computer that is running Windows 7, Windows Server 2008 R2, Windows Vista or Windows Server 2008
This is one i'm not sure about though. audiodg.exe is a service though that runs whenever you play sound. Have you had any other issues with sound on your PC?