Dell 1525 volume change icon missing

Hello,

My father was messing around with my computer and the sound icon that appears when the volume is changed has disappeared.

I have tried to use the Quickset on my dell and have tried to change the volume on the windows mobility center because I have read that it would reactivate my volume change icon. However that has not worked.

I don't know if it has something to do with a Format that I have changed or some box that needed to be checked on the sound window. I am using the Sigma Tell High Definition Audio. Currently I have not enabled any enhancements and my format is 16 bit, 48000 Hz (DVD quality)

If anyone has any suggestions on how to fix my problem or even to restore all sound settings to default I would really appreciate your help!