Try the two card trick I have had some success with this on MacBooks and MacBook Pros. It works best if you can see the disc being prepared for ejection (It sort of lifts off a base and lines up with the loading slot) but failing and being put back in a park position. Insert two plastic cards (library, credit cards, or similar) into the slot and try to hold them as far apart as possible. The idea is to try and get one above the disc being ejected and one below it and, after pressing the eject button, you should be able to grip the disc with the two cards and slowly pull it out. It takes a fair bit of patience and an extra pair of eyes/hands make the process easier. Good luck.

Do you have permissions to that file? Are you trying to copy it from another users account? First make sure that you have permission to copy the files. If not you may have to log in as the owner of the files and either modify the permissions or simply share the folder. This article may help if it is a permissions issue: http://support.microsoft.com/kb/308419