I have a Dell Inspiron Mini 10 laptop running Windows XP. Even though it doesn't have a DVD drive, using an ISO imaging tool I can mount DVD images as local drives. I can then play DVD movies just fine using Windows Media Player, as long as the power cord is plugged in. If unplugged WMP will only play audio and not video.
How can I fix this? I'm not sure if the problem is with Windows Media Player or Windows XP.