This is not to say that your vidcam works anything like mine, but here's how I create vidcaps, just FYI: I have a Canon Optura 50 vidcam that also takes 2 meg still images and stores them on an SD memory card.
My favorite technique for creating vidcaps is to
1) plug the camera into my television, so I can best see what a given frame from a video looks like,
2) find the individual frame with the best image,
3) push the "photo" button on the vidcam's remote control, and the image is stored to the memory card.
Then I can remove the card from the vidcam and plug it into the card reader port in my new computer, upload, and edit the image using one of several editing programs at my disposal.
I don't know if that helps you out any, but I hope it does!