What program?

I am doing a project for school art. I need to make a 3d animation of a fight scene with two prestic looking people. I understand that it may be impossible to learn 3d animation before the deadline, but I will try.
I need to know what FREE 3d modeling and animation program I could use. (Preferably under 50MB download)

You can use Blender 3d it's free, but it has all the features of a professional 3d animation program like 3ds max and Maya that costs thousands of dollars and will require quite some time to learn it , to be able to model and animate something decent in it.

Or Poser which is a commercial software but it has lots of premade 3d character models that are easy to edit, and even a newbie can make some animations with them. When is your deadline?