Mine is an upgrade from poser 4 as well. Some strange, inane little setting must be turned on or off somewhere on my computer. Why else would I apparently be the only one experiencing this problem. Hey, once i get into poser it works great. Maybe with my next additional authorization I'll leave Poser open indefinitely. WinXP hasn't crashed on me yet (almost a year later), so it's possible....;>) As for your mouse reboot situation...well I've just found that if I have 1 gb ram the computer doesn't act up.