Sound no longer working

I installed Windows 2000 Professional onto my moms computer, she has a basic system that relies on the motherboard for sound. Her motherboard is a Micro APX 815 with APG. Her external speakers no longer function. I checked Administrative Tools/Services/ file and there's no longer a file listed as "Windows Audio". Also, the only choice in 'Sound & Audio Devices' (under Control Panel) is the modem. I'm unable to choose anything else.

Thank you for any help, I will of course give out any more information if so required.

Please ignore the information in my signature, that's my computer, not hers.