Hi I was wondering if any1 could help me here as 1 of my mates kid has a dell latitude D610 what came with XP on but has changed it to windows vista and all runs well apart from when you try playing a video in windows media player it only has the sound from that file playing and the screen is just all black and this is the same for a few different type of video file we tried playing on it .? so CAN ANYBODY HELP PLEASE ?