You insert a DVD disk to watch a movie on a Windows Vista-based portable computer. You use Windows Media Player (Wmplayer.exe) or an application in Windows Media Center (Ehshell.exe) to watch the movie. However, the overall volume seems to be too low. For example, when you set maximum gain on all volume controls that are available in the audio mixer, system sounds and CD music playback are loud enough. However, DVD playback volume is still not loud enough.