I have the same problem too, but the upload link did not work. Here is a link to the video I am having an issue with.
http://www.youtube.com/watch?v=IjZHCuOX_AA
I just got this camera, its a Nikon 5100 DSLR . It creates .mov and I edited using Windows Movie Maker on a Windows 7. Please help! Im getting very frustrated!