Increase your virtual memory settings. Poser relies on those settings native to the system, while Vue creates it's own effective swap file. It sounds like you have windows managing them for you, which tends to really muck things up. Right click my computer | Advanced tab | performance -- settings button | Advanced Tab | little button almost at the bottom that says change | set up your VM on a drive that is separate from your windows installtion and ideally from your poser installation as well if possible, and set it to a custome size of at minimum 1024 and a maximum of 3096 or more. Then click set, ok out, reboot, and you should be ok.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)