What is the camera model exactly, JVC 205GB sounds more like its hard drive size 205GB. Have you got the camera manual to tell you what model it is and what format it saves video in.
Did you get any video capture and conversion software CD with the camera.
What file extension shows for the video you have copied to your hard drive, what moviemaker software have you tried to import the file into and what converters have you tried and can you play the video on your pc by clicking on one of the movie files saved to your hard drive.
Just wondering if it's a JVC Everio series saving movie in .MOV format, do you have the free Apple Quicktime player on your pc.
Main thing is to find out what filetype, do you have show file type extensions enabled on your pc so you can see filetype endings, is it XP, Vista pc ?