SM Bus Controller Problem

I have a Compaq Presario SR1602HM that I did a clean reinstallation with Windows XP Home Edition SP2 Version 2002 and I now have a question mark with SM Bus Controller beside it in my device manager and my speakers and microphone do not work anymore. I have tried updating driver to let it find it automatically on the computer with no luck and I also searched in sound, video, and game controllers under the advanced section and all I saw were game controllers. Where do I find the driver to fix this please?