Poser9 is 32 bit, and you do not say what OS you are running.

I think you are boucing in the 2GB Memory limiter.

Monitor your Memory consumption during the renders.

What bucket size?
Reduce bucket size to 16 or 8 or 4 to get the renders to finish.
And set MSR to 1.

And is texture catching enabled in General preferences? => Enable it.
And set all textures to quality or crisp. (Crisp is better.)

And??? What lights, and how many??????

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!