.avi Videos Jumpy using Divx Player

I have several videos in .avi format that I moved over from my old PC. I downloaded the Divx player to play them, and was pleased to see that it played all the files well, but they are kinda jumpy. Like, it'll be playing smoothly and it'll pause for just a half a second or so and keep going, so the video and audio kinda freeze and then keep going. It happens pretty frequently and is very distarcting. I first thought it was the files, since I had never played them after I downloaded them, but I just played a video I'd watched on my PC and it has the same problem on my Mac, but was perfect on the PC. Is Divx not the right program to be using to play my avi's? Is there something I can do to make them stop being jumpy?

I should mention that it's a brand new SR MBP and all other video stuff plays perfectly, DVD's play flawlessly, and other video file types play smoothly as well. I just have the problem with avi.