Sometimes the codecs used aren't the latest. I know that alot of things i download are encoded in 3.11a Divx which is different from all the other Divxes. There is a program called Gspot that tells you what codec you need. You can get it
here. I've never used it so i don't know how well it works, but it is worth a shot. If all else fails you can go
here for different multi-codec packs if you don't want to download a program.
If you want a VCD, then you might want to check
this out. And you might find
this forum to be of some use.
Good Luck
