Audio device not showing in control panel

Hello,
I noticed that my audio icon is missing from my task bar. I recently had a new harddrive and cd/dvd installed but can't recall if it was there and disappeared or was never there to begin with.

Windows XP home came installed. If I open "Sounds and Audio Devices Properties" from control panel, there is no audio device listed and all the checkboxes (such as "show icon on task bar") are all de-activated- you can't check or uncheck them.

Any ideas how to fix this?

Thank you!