That means your disc is dirty, smudged, or badly scratched. If it's not any of those things than it could be your drive. I've had stupid problems like that with CDs only in certain drives while they work fine in others.
"Booyah! Look out, LeChuck! Here comes Guybrush Threepwood's glowing sword of hot monkey vengeance!"
-Guybrush Threepwood, Tales of Monkey Island