I am looking to buy a DVD Decoder that will work in my windows media player 11.0. I have windows xp with SP 3. Can anyone tell me what would be a good Decoder to buy at a fairly cheap price? I just need to download this software and will not need a backup disk. I unterstand that windows XP will not be updated after March 2014 and this is why I don't want to put much money in this. I have a mathtudor DVD that I need to view on this computer and it tells me I need a DVD decoder to view it. Thanks.