I have a gateway gm5076e desktop which i recently formatted and reinstalled winxp media center edition. but now, i have no sound. i called tech support-let me add that gateway has by far the worst technical support ever-and they told me to install the realtek ac 97 audio driver, which i did. but i still dont have any sound. and when i look in sounds and audio devices in control panel it says there isn't an audio device installed.