I happen to like Poser 5 myself - it does a good job and works just fine. One thing, if you do get Poser 5, download the Service Pack 3 for it - corrects a number of bugs, improves stability and firefly renders become a little faster. I would definitely agree with using it in either NT/XP or 2000 as well. I have 1 Gb RAM in my PC together with an Athlon XP2000 CPU and it runs just fine. Shadowdancer