isaacnewton:

You may only need to upgrade the drivers for your video card. Poser really needs the most up-to-date drivers for the video card to work right using openGL. Unfortunately, some people have had problems even with their most up-to-date drivers installed.

With PoserPro 2010 it is also a good idea to always have the most up-to-date version of Adobe Flash, though that will not help your preview problem.

lmk

Probably edited for spelling, grammer, punctuation, or typos.