I'm surprised that you can render all of that with only 1 gig of memory!

To my knowledge Poser can handle as many figures as your computer can render.

Here is a screenshot of my render settings for Poser 6.

I agree that it looks like pixel samples is the problem. I have mine at 3, while you have yours at 1

And don't forget to check "smooth polygons"

If for some reason you find your computer coughing and wheezing while trying to render large scenes like the one you have, you can always hide figures and render others until they are all rendered, and then assemble them in a graphic program.  That's what I have to do with my computer.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi