URGENT! Particles Will Not Render

I’m creating this short animation where blocks burst out of the ground, shooting out particles, as the camera is flying past. The problem I’m having is that the particles are not rendering. I can see them in the 3D window, but not when it is rendered. It was working before, and I don’t understand why it isn’t working now. It’s just a normal render, not cycles or anything. I’m not sure if I changed a setting by accident or something else. It’s urgent that this problem gets solved as this animation has to be done relatively soon.

I’m having issues uploading the .blend file on this site. You can access it from here:

https://docs.google.com/open?id=0B22vsEyFcYRWcjljUGJPVmVMaU0

For the Particle object, remove the collision modifier

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