Failed to read dvd with anydvd?

have a about 10 of my dvds when i insert the dvd
i get this message:


failed to read dvd

dvd media is dirty
dvd media is damaged

your drive is a region locked RPC2 drive
which does not allow reading of a scrambled sectorsfrom a different region and u try to read a dvd from a different region.

known drives have this problem.u can try and find a RPC1 patched firmware.

your drive is a RPC2 drive that has yet to be assigned to region 1

there all play on my standard dvd player.all my other dvdrs read and write.just about a dozen .in which i get this message