I got a Elsa Gladiac 920 GeForce 3 for my new system. Should I install the DVD player that came with it, or get something else like powerDVD for it?

I dont know why but Media Player Classic stutters visual wise and audio wise during every dvd I present it with on my machine, but PowerDVD 5 (I currently use) does not at all?<BR><BR>Why is ...