You get the CRC error while copying the DVD to the temp file, right? This means most probably that you have a bad backup there, either due to a bad burn procedure, bad media, bad storage etc.
Try reading the DVD at slower speed, maybe try with another drive. There's not much you can do i am afraid. If you get CRC errors a lot with other media also while reading from the drive, updating your ide/chipset drivers and drive firmware and checking your IDE cables might be a wise thing to do.