Sound on Windows XP Pro

I recently installed Windows XP Pro nto a Compaq Presario 2100…..I have downloaded and installed new drivers. When I go to BIOS, there is nothing listed for audio….and there are no explanation points or question marks in the device manager. Any suggestions would be helpful.

Also, when I got control panel – sounds and devices – it shows “no audio device”, and everythng is greyed out…