Hi I had the same problems with Win98SE. I recently upgraded to xp pro and haven't had Poser hang up during a render since. I was able to render an animation that has 14 characters plus their clothing( 28 figures in all) and a full set, 110 frames at 640x480, anti alias, full lights and shadows... It rendered on using xp, but it took a little over 21 hours to finish. I was never able to get past about frame 50 when I was using Win98. Ed