My brand new Spectre 13t-3000 Ultrabook is having the same issue as this guy is having with Windows Movie Maker:
https://www.youtube.com/watch?v=TEZZWBMZbaU
Once this issue starts with Movie Maker, it happens with the sound from every other component of the software. I have installed the recommended audio driver from hp support, and that has not fixed the issue. Please help!