Hi Usa2340,
Could you check if your sound card drive has been installed?
E.g. Click on "Start Menu" -> Right click on "Computer" ->"Properties" -> Click on "Device Manager"
Then you can see if there has any ! on "Sound, video and gaming controller" if so, maybe you can try to download a driver for your sound card.
if it is a onboard sound card, maybe you can check on your BIOS, if you have enabled it.
Please correct me if my concept is wrong
Chi