I guess the others missed this one. Does your computer's motherboard have a setup CD?? Its the disc that says something like "motherboard setup".It should come when you bought your PC. When Windows 7 was installed, some of the drivers
have to be installed again and to do that, you have to run the motherboard's setup CD because it most likely contains the driver
specifically designed for the built-in sound adapter. So if you have a motherboard's setup CD, run it. But whether or not that will work with Windows 7 is a question but better than not getting a compatible driver at all.