I think u r using the same Drives that u used for XP. I suggest u to upgrade the drivers for windows 7. Whats u r PC model...?
Go to control panel then hardware and sound then go to manage my sound devices under that will find playback under that you will have to click on speakers(single click) and and then the configure option gets activated then you have the option to check the speaker functionality and also you can go to sound tab select a sound and click on test to check it
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