You seem to be saying you've tried it in both your computers, and at one stage it worked in one of them.
Is there a chance it was damaged while in the working one? Could it have been written to? I don't really know, can CDs be "formatted to be used on other computers" the same as DVDs and if so, is there a chance it can beat protections?
Is there a minute scratch at the beginning, and have you tried cleaning it with one of the magic products - including huffing on it?
Have you got some pals that will let you try it in theirs? Just broadening the read width range on the laser perhaps.
Yes, I edited. So what?