I'm pretty sure I have all the necessary codecs. I have a programme called GSpot which is supposed to tell you if you're missing codecs and it didn't pick up anything missing.

I have several different players I've tried ranging from Media Player to PowerDVD to Leadtek Winfast DVD and none seem to manage. They all played it but it was as if all the frames weren't there. The sound is in time but it's like watching an animated film that's been done on the cheap and skips from scene to scene without fluid movement (I hope that makes sense). Also, the programme I used on the other computer was one that I used on this one too and as far as I know the codecs on the other computer are the same as on this one although the other computer is considerably newer than this one.