I can't open my new Bleach avi episodes on my XP cpu. Has something changed about avi? How can i get em to wrk?

I use to be able to watch the older Bleach episodes in avi format and i still can, but the recent ones i cant. Has something changed, or do i need to do something with my computer?I can't open my new Bleach avi episodes on my XP cpu. Has something changed about avi? How can i get em to wrk?Most likely u need to download and install codecs i recomend k-lite codec any version should do it