The 64 bit thing is due to their copy protection scheme - not the software itself.

I don't think you will get XP32 to recognize 4 gig - 3 is about the best you can hope for.

Max 9 - 32bit  doesn't seem to like the 3-gig switch. It will always choke around 1.8 gigs memory usage on me. Max 8 was actually better - I could get it to go up to arouns 2.5 gigs.

Avoid Lightcache and use QMC as your secondary bounce. LC eats a LOT of memory.

"Does anyone know a way to extract the mesh/texture data from the files hosted by Bodystudio?"

I just usually clone the mesh. Maybe I've misunderstood the question.

"I haven't figured out if it is possible to instance the Poser files"

It should "in theory" work fine. Ask at the Vray board.