Well tbh you are low on RAM so Poser probably does run out of memory.   I'd suggest you check everything in this scene you're trying to render and see if maybe you can reduce the size of some texture maps.   4000x4000 wouldn't really be necessary for a .jpg image not intended for print.   Start from there and see if the scene renders once you reduce texture size on some figures/props.  Make sure you don't render with depth map shadows and use raytraced instead.   It would also be a good idea to familiarize yourself with the manual adjustment of the render settings so you can fine tune them instead of relying on the defaults.   Reduce your bucket size to 8 as well.