Codec error message when trying to import a video with windows movie maker?

every time i try to import a video using windows movie maker with windows vista this message appears. "The file D:\DCIM\101KM341\101_0348.MOV cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the... show more every time i try to import a video using windows movie maker with windows vista this message appears. "The file D:\DCIM\101KM341\101_0348.MOV cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again." What should ido how do i know which one to install?? Can anyone help me but you will need to explain it like i'm a child ha ha i'm not technical at all. thanks
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