Can't open my photo CD's

I am hoping somebody can help. I have about 6 CD’s with some recent photos that I took. Suddenly when I put the disks in, I get an error message that reads “the CD Rom drive is currently open, close drive and try again”?? These disks are only a few weeks old…Does anybody have any ideas as to what the problem might be?

What happens when you insert a music CD or a movie DVD? What operating system do you use? Can you give any computer specs? What program did you use to burn the photos?

I am running windows XP home. Yes audio CDs/DVD’s work. Not sure of the program used…they were burned at the same place that printed the pictures. I was able to view all them at one time so I know they work