Using a gateway mx6421 laptop, installed a 7200rpm hitachi hd to improve performance over the old 4200rpm from the factory. retinstalled windows xp media center, downloaded all drivers from gateway for the mx6421. the drive is much faster and everything works fine with the exception of the audio. the audio driver "fails" during installation. the conexant driver i am using is specific for this laptop model from gateway's website. if i swap out the new drive and use the old one with all the preinstalled software and drivers the sound works fine. but under no circumstances can i get the sound to work with the new drive. i contacted gateways tech support and they were of no help. does anyone have any idea what is wrong? any help would be very much appreciated. thanks.