Ya'll making this into a big thing when it's probably not all that bad. Does your volume work at all or just for that video because that video was working with Quicktime and Quicktime is a tweak and sometimes you just see it and can't hear shit. If the sound isn't working at all though then go to Start, Control Panel, Sound Speech and Audio Devices, then to Sounds and Audio Devices. You can check everything there and make sure you got everything hooked up right and the volumes are set right too.