|There are several possible reasons, four of which spring to mind:|
1) It may be a "dual layer" DVD and your DVD drive may not be able to read dual layer discs.
2) Or the video content on the DVD may be in a video format that either Windows or the DVD drive might not be compatible with.
3) If it's a Windows software issue, you may not have the required media player installed which understands the video format on the DVD (for example, if it's DivX format, you need a media player which is compatible with DivX).
4) Lastly, the DVD copy may not have been done properly.
message edited by phil22