Well then your DVD drive in your

laptop may have problem playing some kind of DVDs. In
genernal, it shouldn't be the case. But some DVD drive is
very picky about DVD discs. All DVDs from China are not
good quality. It may be playable on some stand-alone DVD
players made by China but it may not playable on your
laptop. You can try to find out if there is a firmware
upgrade for your laptop DVD drive. If it still doesn't
help then you're out of luck.

http://forum.rpc1.org/dl_all.php