Disc Key does not Correspond ERROR?

[Evil Homer]

I havn't downloaded anything, I made the image myself with Alcohol 120 so the CD Key is the same one I use when I play the game with the original. I've checked in the registry and the CD Key is the correct original key but it still comes up incorrect key when I try to run from the image, I have no idea why, maybe it is the lens getting dirty, I will have to clean it and see. The only thing there is that both my drives are nearly new, 2 and 3 months old, even my USB drive is only a few weeks old but who knows maybe cleaning them will work, hope so!
Thanks for help anyway guys