I had horrible stuttering issues on my old Dell Dimension 8100 and never could figure out a cure. I tried moving the sound card around to different slots to no avail. I know I've heard of this program before at least a year or more back. Of all those listed I'd suggest changing the onboard sound first if you are using that. Is this the kind of stuttering where like the video freezes and the sound loops for two seconds then suddenly the video unfreezes and you've moved a ton?