movie maker made video will only play audio but show black screen for entire video

I downloaded the free Windows Essential download from Windows.com, for the use of Movie Maker, for Windows 7 (3 days ago, Sept '13)

I have uploaded AVCHD raw video clips originally obtained with a JVC Everio camcorder (bought at Costco in 2012) into Movie Maker to make a video.

the 11 minutes of AVCHD raw video is uploaded successfully into Movie Maker.  in trial and error, I selected the "Save Movie" button and selected the "for high definition display," "for computer" and "for email" options.  After several minutes of allowing the MM software to do the steps necessary, a window comes up to say the video can be played or opened in its respective folder.  I tried for all 3 saved options to immediately view and to view after opening in its folder and the videos all play the audio but only show a black screen for the entire video.

    ??????   Has anybody had this problem and/or know how to solve it?

I have used WMM for several years, but my hard drive crashed and upon repair I had to download this version of Movie Maker that may or may not have been the same version that was on the computer before.  I am not computer technical saavy so any help would be appreciated.

Thanks,

T