I noticed a copyrighted CD was getting very scratched, so I decided to make a back-up. I got a warning that it was copyrighted, and proceeded anyway. I successfully made a copy, but now neither of them will work on this computer. I tried both in another computer, and they both work. Out of curiosity (or stupidity) I burned a copy of the original on the second computer - and now it won't recognize these disks, either. Can any one tell me what happened and how to fix it?

It happened on a computer running XP and Nero, and also an older version of windows.

Thanks,
JoAnne