I am no expert.  But stutters?  Could that be a resource problem?  It is best to post your dxiag and let the real experts take a look.  With the dxdiag, you only need to show the cpu, memory, gpu, OS, and audio info (that should take up less room).  Just cut and paste it into a text file and then post.
Other than that, AH takes up a lot of resources (not sure if that is the right word), so I would also see if dialing back your video in game settings improves the sound quality (less stutters) or do you get video stutters also associated with game play?