If you have "on-board" sound, the drivers should be on a driver disk that came with the computer/motherboard. Or you can go to website of the computer or motherboard manufacturer and look for drivers. (If it's on-board sound, the connectors you use to plug the speakers, etc., in will be in the same area as the keyboard, mouse, USB, etc., connectors.)
If you have a separate sound card, just open up the computer, take the sound card out (if necessary), and have a look at what model number and manufacturer are marked on it.
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