Almost all DivX movies I download work fine in XP using WinMP8, some however only has sound but works fine when I try them in The Playa Player. I have noticed it's almost always "older" movies that has this problem, like some of the first season tv-show "Black Adder" with Rowan Atkinson has this behaviour -all season 2 and 3 works fine. Seen this with Arnie-classic "Predator" too.

What's this about and how may I solve it?