Is your disc at all scratched? If so, that is likely the problem here. Try cleaning the disc.
To clean the disc, get a soft, non-abrasive cloth (such as a glasses cleaning cloth) and some mild dish detergent. Mix a drop or two of detergent with a cup of water. Apply the solution with the cloth, always moving the cloth from the center of the disc outwards; never try to clean a disc in circular motions.
You can also find disc cleaning kits at most electronics retailers.
Answers & Comments
Is your disc at all scratched? If so, that is likely the problem here. Try cleaning the disc.
To clean the disc, get a soft, non-abrasive cloth (such as a glasses cleaning cloth) and some mild dish detergent. Mix a drop or two of detergent with a cup of water. Apply the solution with the cloth, always moving the cloth from the center of the disc outwards; never try to clean a disc in circular motions.
You can also find disc cleaning kits at most electronics retailers.