http://www.nikonchat.com/nikon-codecs/

How to change a video format?
I want to edit a video in Windows Movie Maker. I use a Nikon Coolpix L11 to record these videos. Whenever try loading them into Windows Movie Maker, which only says that cannot work because the format is not right, so I'm going to a website to change the format, and I do, and save me. I change the format suitable for Windows Movie Maker, when I try to put it into Windows Movie Maker it says this: The required codec was not downloaded automatically because the Download codecs automatically check box is not selected in the Options dialog box .. HELP! What am I doing wrong?
The Movement is not a very reliable program. What you are experiencing is a common problem among users. You can try the K-lite codec pack or get another program reliable video editing.
HIM 2009 Day 2