Well I was not able to find your sound card model , but looks like i could find the right drivers. Can you make sure that realtek sound card is in your system ?

For the time being, use the vista drivers for your sound card and see if it works. You can download it from below link of Hasee.

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It looks like they havent released drivers for windows 7. We could help better if you can put the exact name of your sound card using windows xp device manager where its working perfectly.

You can access device manager here right click on my computer>>manage>>device manager.