I must admit that, having read Sealtm2's system specifications I assumed "Windows 2000 or later" and almost commented that it seemed almost designed to cope with Poser 5 - but, well, each of us must make up their own mind. Me, I wish I hadn't bought Poser 5 when I did - I'd rather have paid $140 or less at amazon.com... but I'd still have bought it, it's head and shoulders above Poser 4. For me.