At the risk of sounding like a jerk, the solution is (gasp!) to use a version of Poser that isn't 10 years old. Yes, Poser 4 may be the tried-and-true version for most people and it may even "run faster" for some tasks. Until that is, you get the dreaded "Out of memory" generic error message when Poser can't find an obj file or a texture file and you scream at it, wondering why you're "out of memory" on a machine that has 3G of RAM.

I recommend getting Poser 7, or at least Poser 6.
You can probably pass on getting Poser 5 since P6 basically corrects all the issues found in P5.

VanishingPoint... Advanced 3D Modeling Solutions