What editing system should I try?

I don't know the exact name of my camera, but it's a Nikon and it's high def and the video I record on it has to "be prepared" in windows movie maker so that it's playable (i guess because movie maker isn't made for high def). The problem is that the preparing takes FOREVER. I've tried to edit videos on ViewNX2, the editing software that came with my camera, but the video story board only allows for four video clips: c so what should I do? What's a good, easy to use system I can buy that would fit my needs?

Added (1). **I meant windows live movie maker: T

I use Windows LIVE Movie Maker. It does HD videos and doesn't take too terribly long to make it playable.