Did you download the 64-bit Win7 (or the 64-bit Vista) driver? Did you install it? E.g., if the file you downloaded was a .exe extension, you double-click on the file to install the driver. If it was a .rar or .zip, you have to unzip it and then double-click on the extracted .exe to install the driver. If you did that, re-start the computer, enter the BIOS settings and verify that the on-board sound in "Enabled," if it is not enabled, enable it, save settings and exit BIOS. You should have sound after the OS starts.