Sound devices

I am the administrator but I cannot seem to change my sound devices. When I
go to sound and audio devices and click on any of the volume, audio or voice
tabs I cannot change anything. It also states no play back device and no
audio device. However, all other users on this same machine can playback
windows media player with no issues. Seems to have just happened after
loading Itunes for an IPod. Thank you
--
Super G
.