mabfairyqeen, I have a Dell, Pentium III, 866 mHz, 512 MB SDRAM, Windows ME. When I had collision detection on, first it seemed to take a very long time to do the dynamics, but then it just completely got hung up. I can do collision detection on cloth in the cloth room, but it seems that all those strands of hair were a little too much. With the hair and cloth stuff, sometimes things work for me, sometimes they don't. I'm not sure yet if it's me or the computer or P5. I'll have to experiment more.