I've had CD creator since version 2, it's NEVER collided with anything else.... in spite of all the tricky s/w I use. As to operating systems - I finally switched from 98SE to 2K this summer, and oboyoboy, what a difference..... Now Poser only hangs when the scene contains 100 props and 150 texs and the like. Before it crapped out with just 2 figures.