unnerd

Thanks dbknox but you are way ahead of me. You can tell by my name that I am very un-nerdy ie I am a computer novice.
The CDs I refer to are all pre-recorded albums bought from various retail outlets. When I try to play or rip them using windows media player some work OK and some just don't work at all nor are they even acknowledged.
Perhaps my computer doesn't like some of my music choices. Seriously though HELP!