NetMeeting and DVD playback both use the overlay mixer. Only one program at a time can gain access to the overlay mixer. Another possible solution is that the computer is running Windows 2000 Server and Terminal Services is installed. When Terminal Services is installed, you cannot play a DVD because of high bandwidth requirements of video playback over a Terminal Services client connection. DVD Region Settings DVD movie titles and DVD-ROM drives both have a region code.
Region codes prevent playback of certain DVDs in certain geographical regions.
Region codes are part of the DVD specification. You can only play a region 1 DVD movie title on a DVD-ROM drive that is set for region 1. If you set a DVD movie title to region 0, you should be able to play the DVD movie on any DVD-ROM drive. When you reach the limit of changes that are allowed, you cannot reset the limit by reinstalling Windows 2000. Contact the manufacturer of your DVD-ROM drive to find out if you can reset the region.