Run msconfig and do a process of elimination. I had the same problem and through trial and error, found the offending dll file. Took it out of the loading process, and the sound stutter went away. My system has been running stutter free for over a month now, and none of my apps seem to need the offending file. I have a P4c 2.4ghz running XP Pro. My video and sound cards are different from yours, but it might be the same problem. In my case, the offending file was: nvcpl associated with rundll32.exe. Good luck and happy hunting
Robert