If you want the stability with NT I would go with Windows 2000 Pro. I went from 98SE to 2000 Pro and had it for about 4 months now and haven`t had one problem, very solid OS. I have an Intel P4 1.5 with 256mb of PC800 memory. I am running C1.1, Amapi 6, Bryce5 and Poser4. Go with a proven OS Windows 2000. Dave