Problem with King John's codec guide

[Feli]

I accidentally posted this in the newbie forum instead of here:

I downloaded and played all the files in the guide and about half of them are not working properly. Which was to be expected, since some of the .avi-files I have on my computer can't be played or converted to .mpg either.
My question is: what do I do now? How do I find out which codecs are missing and more importantly where do I find those codecs?

Oh, and they have to be Windows XP compatible, I think that's my biggest promblem, because most of the codecs I used to have (mostly packages like Nimo or Crystal) can't be installed anymore. Not even the divx package.

[Baldrick]

I moved your topic to the newbie section. Please ONLY post user guides here.