"Try cleaning the movie disc. If that does not work, if you are using an external DVD drive, please disconnect and reconnect the drive to your computer. Also try using an internal drive.
It is possible the original movie you have has some bad sectors.
(Cyclic Redundancy Check) or CRC Error
This can happen on various reasons:
1) DVD media is dirty - you can try to clean it
2) DVD media is damaged, you have to replace it
3) Your drive is a region locked rpc2 drive, which does not allow reading of scrambled sectors from a different region and try to read a DVD from a different region.
You can try to find a rpc1 patched firmware at
www.rpc1.com
4) Your drive is an rpc2 drive that has not yet been assigned a region. try to assign one, or try to find a rpc1 patched firmware.
The link is there takes you too the firmware page.
To find the firmware you currently have use this:
http://www.videohelp.com/tools?tool=DVDInfoPro
If it's not scratched or dirty I suggest returning it and get another one due to the manufacturer bad press (burn). "
taken from
http://club.cdfreaks.com/showpost.php?p=1669766&postcount=2