It should play on any Macintosh computer with I DVD installed, (it is recorded on a Mac G5 dual processor with operating system OS 10) or for that matter on any home DVD player. I will look at home to see if it has to be recorded for Mac and PC platforms, but I think that it should play back on a PC platform as it is anyway (CD's have to be recorded as "mac & PC" to be readable on both systems but I thought that DVD's were compatable to both automatically) What computer system are you trying to play it on?
Most of the DVD's are recorded in PAL and you have to set "older" type DVD players to that format for it to play back, the newer players automatically recognise all the different formats and play back automatically regardless of the recorded format.