Looking for ways to solve stuttering while listening to streaming audio, discovered that when stuttering occurred, System CPU usage was above 20%. At 20 or below, no stutter, although DPC Latency Checker might show latency around 150-200.
Checked all drivers, etc, as suggested by DPC info box.
Finally, tried stopping all services related to WD. Western Digital's file management software seems to be the problem. I did stop every one of them and have had not stutter for approaching half an hour. Stuttering was occurring every minute or so, lasting a moment, or several.
This may not be the only problem, but so far so good, and I hope it helps.