Can you put the disk from the camera into the pc's dvd rom drawer, hold the shift key down while doing that so it doesn't try and self play. Then open the to view the disks contents, probably a video ts folder, you could try dragging a copy of the video ts folder to the desktop, I'm guessing the larger sized VOB files in the video ts folder will be your video.
If so you could use another video editing program to edit the vob files.
I'm not sure if Windows Live Moviemaker for 7 accepts input of VOB files, most other video editing software does and maybe from the disk itself would save even the dragging of video ts folder to desktop if so.
However if you have the video ts folder on the desktop and open it any large VOB files you click on should play in whatever dvd playing software you have on your pc.