How do you combine to different videos?

Use vdub

I believe you are looking at the way to merge two different video segments. This can be done pretty easily by using various software. As I recall, movie maker does have this kind of function, you just have to import the second video which will be divided into a number of video frames and paste them in the first video frames. You should do more explore on your movie maker.

I only have Windows Live Movie Maker, and that's where I make stuffs. I'm also quite amateur in making fusions, effects but I just simply do it because I just love doing it. I even made a Music Video of Avril Lavigne's "Don't Tell Me" by taking some parts from "Twilight- New Moon" and joined it together along with the music with a few effects and fusions. Here's the link of that Video- http://www.youtube.com/watch?v=-hLAkvY4qVM