How do I get videos from my HD camera into windows movie maker?

I have a JVC HD Everio GZ-HM300BU, and it works great and the videos look great but I need to get the video files into windows movie maker, but it won't let me do that. The software that it came with to edit videos is TERRIBLE and I cannot do anything half decent with it. Is there a way to get the video files into movie maker?