Sky... Re-installing is easy and you don't need to back anything up. It only replaces the files needed to run Bryce and leaves all your data intact. Nothing will be deleted. Just run the setup file on your Bryce CD. Try to install it over the top of the one already on your drive and all your presets etc. will still be there... it seems more likely to be RAM, but give the re-install a try. Might work. Howie