Being abble to watch a movie is not the same than having all the codecs : you can have a directshow filter that do the work, and that is completly different from a codec.
Avs use codecs only with "avisource" and directshow filters only with "directshowsource".
Here I guess you have ffdshow, that is a wonderfull directshow filter that can replace xvid, divx, huffyuy, mjpg... en a lot of other codecs. But it is NOT a codec and then NOT use by avisynth.
You must DL and install the codecs needed by your avi if you want to convert them in KVCD.
(note: your problem can also come from the audio, for instance if the audio of your avi is in ogg vorbis format).
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