Motion JPEG codec for free?

Hi!
To be able to see on my W2K computer the avi files taken with my Canon camera, I understood so far that I need to install the “Motion JPEG” codec.
But... I couldn’t find till now this codec for free on the net. On both morgan-multimedia.com and mainconcept.com websites, they sell complete softwares. I just want to see my small movie on the computer, but not to edit them!
I’m really suprised Canon doesn’t provide to their customers any tools to see the files that are taken with their cameras...?
Any advice?
Thanks,
Renzo

Try quicktime player (my fujifilm camera comes with quicktime 4 to display mjpeg avi files).