Try making an ISO of it, using Alcohol 120%, and setting it to [highlight]not[/highlight] ignore errors. If you have retries set low, that'll tell you if your disk is flaky. If you have retries set high, and the disk doesn't have any really bad errors, you might be able to get a working ISO out of it.
You could then play from the ISO, or if you're short on drive space, remaster onto CDR.
Dan