I just tried it but there are 2 file types for each video clip which came from the JVC camcorder MOV and MOI, the MOV imports into Windows Movie Maker but does not show I am guessing without the MOI file, the MOI files cannot import giving this error message :
The file C:\pics\von\video\MOV001.MOI 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.
Do you have these same 2 file types [Mov and MOI] coming from yuor same camcorder please?