Wow, I have never had one to quite what you describe. Usually the other way around, plays fine in PC, dies in standalone player. Do you have any analysis tools, like VSO Inspector or Nero CD/DVD Speed? Both are free and will scan the disc for bad spots. The old DVD Decrypter (the one by Lightning_UK, also free) could also read marginal discs well. If you open the disc with windows explorer, can you see the VIDEO_TS folder and the files inside? (Sorry if you've answered that already). I don't have a link for it but as Stormjumper suggested, ISObuster might be able to extract the files.