it's sacrilidge on here to say this, but I have fixed many a cd and DVD with the DiscDR RX. Loud, and crude, but it works in most cases.
I had an Elton John ...To Be Continued disc (no. 2 with all the best songs on it) that hadn't played correctly in 10 plus years, that was fixed with the Disc Dr RX.
Of course, then rip all the songs to a hard drive with a hgih sample rate such as FLAC or WAV and don't worry about it again.