Hi garyline,
Can you just take us through, step by step, what you are doing? First of all, what Mac do you have and what OS?
You mention "disc". Do you mean a CD? If so, are you working with a Mac that has an in-built CD player or are you using an external device.
What type of files are on the CD—text, photo, music or a mixture of these and/or others?
You mention a drag and drop action—then you "can't progress further". Do you get a message? If yes, what does it say? Or does nothing happen?
I hope this friendly-intended advice gives you some idea of what we need to help you out.
Ian