Try Unstoppable Copier to rip the files off the discs and then burn them off.
Used this method a couple times successfully.
maybe try a program like cd check, as it "rips" all data from a damaged disc, but i guess it only works for data, and you are trying to install a game
Good luck. I've used one of these ripping programs on a scratched disk myself and it worked like a charm so there must be something out there.