Wow You got it bad man. I was having freeze ups like you describe that got progressively worse until I couldn't use Poser 5 (On a similar speced machine too). I think my instability may have stemmed from copying my Poser 4 Runtime into P5 when I got my new comp. (On the old one I have the P4 runtime linked). Basically I did a clean re-install and this time installed Poser 4 on the new comp, copied Over the runtime to it and linked it. I've had basically no problems since. If I were you I'd do a clean install. :(