I did buy this new from Best Buy online 2 weeks ago.
I also asked this on GameFAQs, and someone there suggested the same thing. I was able to copy the contents of Disk 1 & 3 (without another program) but 2 & 4 froze, so I am assuming they are scratched, even though there are no notable marks. I'm going to try an...easier method of getting the files on the damaged disks though. Hopefully that will work.