Running XP pro and have just bought a set of Logitech x-240 speakers. Plugged them in as advised and have gone through the Realtek HD audio manager set-up and the speakers play the demo music fine. When I try playing a video, wav file or anything else I get nothing ! I've tried most things that have been posted by Muskie already but can not unistall the Realtek HD Audio driver in Device Manager. Error I get is "Failed to uninstall the device. The device may be required to boot up the computer" Tried downloading and installing the latest drivers from the Realtek website but keep getting an install failure error. "Update Driver" in Device Manager = nothing happens (no options etc.) Please help as this system is only 1 month old and has been working fine so far.