Can you help me understand My Movie Maker?

I got some VHS tapes downloaded to DVD’s. I want to make a compilation of the best ones, but I’m having a hard time figuring out what Movie Maker is doing.

I have a single CD in the drive. When I click on “Add Videos,” there are 5 different “files” or something to choose from. I don’t understand that.

Also, when I start to play one, it goes all the way through from where it started, maybe 12 seconds. Then when I move the line on the video back ward, it pulls out completely different video images than what just played.

Can you help me? Or recommend a good, free movie maker?