1 I assume we are talking 512Megs to 1.025 gb ?? Why not just set them both to 512 megs Then if you use Nortons Speed disk it will set aside an area for your disk for the SwapFile(Virtual Memory ) There seems to be 2 types of crashes The smear crash and the lockup crash exactly as you have described. After one of these crashes always restart your machine You have some major disaster if it never gets going?? 2 There is no limit as such. But you have managed to render at some stage ??? 3 Quite honestly I think you need to reload Poser4 Also when runing Poser shut everything else down would be my advice