Usually that tells you that the driver may not be installed. Remove he camera from the USP or however you have it connect to the computer and try to re-install the drivers with the software that came with it. This is all I could find on your unit at this time. http://support.jvc.com/consumer/custrel/software_files/720.exe
Hope this helped some....
Kevin
I have jvc Gr D720 E camecorder but I have no drivers and the camera not attach with pc with drivers...
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jvc gr d720e handy cam drivers download where i can find thet driver i can't take it anymore...
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JVC GR D720E Handy Cam Drivers Download where i can find thet driver i can't take it anymore ahhhhhhhhh!!!@#!!##$!!!!!