You have to figure out what audio card you have first. If it's an onboard sound device, just go to the motherboard manufacturer's website, find the support section, input your model number and download the drivers.
if it's an add-in card, they should be on your CD.
If you don't know either, run windows update and it should figure out it's not working right and suggest the right driver.
If you don't know the motherboard and windows update didn't help, download and run the 'everest home' program available Here
Run and find it under 'computer' on the left hand pane, and 'motherboard' in the right.
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