If it's a desktop (you didn't say), it can use generic drivers, ie: Realtek, Cmedia, ADI SoundMAX, VIA, or IDT (formerly Sigmatel). But if it's a laptop, you must use specific drivers from the laptop maker. Either way, you gotta tell us what the sound chip is before we can help. If you don't know open the pc and use a flashlight and magnifying glass to read the sound chip number and post it.
Stumped, then try this:
To find make and model of pc hardware, EVEREST Home Edition
is a free system diagnostics, system information program that will id most hardware onboard a mb. as well as the actual motherboard. It will, in some cases, actually provide a download link for the driver.
Alternate Everest download link: (offers 2 sites to dl program from)
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is BLUE
this is a link to the web site for that particular hardware.
If you have additional questions or need further help, please post a "copy and paste" of the COMPUTER SUMMARY report (Leave out the Debug–PCI section) from Everest.