I have a 3-year-old PII/400 with 512k RAM, an 8meg Matrox card, and Win98SE. Like moonbiter, I can pack Poser 4 to the brim and keep running (albiet a tad slow). When I had the original Poser4 I often created scenes and rendered 8 straight hours or more with several props and characters (none DAZ) without a lockup or much of a slow down. Installation of the Pro Pack slowed things a bit, but not much. Michael and Vicky are what really slow me down. But I have worked with up to eight of them in one scene without a lock up. Come to think of it, Poser never locks up on me! Hey, thanks CL!