Does the place you bought it from have any display computers? If so, they should be willing to try either installing it there or trying to extract the files. If that works, you might be able to copy them to a CD-RW disk, if not, they should have to admit there is a defect in the disk, which will probably require them to at least exchange it. There aren't any scratches or scuffs on the CDs, are there?
If not, do you have access to a different computer you could try extracting the files on (hopefully one with a CD-RW drive)? 75 and 160MB might be a tad large to email. Again, if two different computers can not extract the files, the place where you bought it would be hard pressed to claim it was a software issue.
