I'm running Windows 98. I also can run Photohop 6 and Poser 4 in the same time, with no crashes. Crashes only seem to happen when a lot of figires and or a lot of textures (high res) are involved. For exemple, i was using 2 human characters and clothes, and table with a chair. I just can't render it. i have to remove some stuff before it can hardly try to render , at the speed of mmy old P2 400... Its sucks.