I recieved a dvd-rom from a business associate and it plays fine in my ps2 and dvd player, but when played on my pc the sound is either distorted on one drive (pioneer dvd-rw dvr-107D) or has no sound at all on the other (i/o magic 16x dvd/rw/r dual layer). Do not and have not had any problems with any other dvd. I tried backing up with dvd decrypter but the problem is still there. Any ideas on the problem? Is this some sort of encryption to keep it from being backed up? Thanks for the help.