XP Volume Control Muted

I have created several different XP images, for different make PCs, with PowerQuest Deploy Center. Now whenever I load the image on a PC and complete the initial setup (used Sysprep prior to imaging) the machine boots up with the volume control muted under each profile. Mute also comes back after screensaver has activated.
Does anyone know where, either in registry or policy editor, I can find the source of this problem and correct?