Registry Key for Autoarrange on desktop icons

I'm trying to configure a clone cd for my computer. I would like it to automatically have the Autoarrange option enabled for the desktop icons. It's not the same thing as in the folder settings. I've tried everything under the sun to figure out what the registry key is. I'm starting to think it might not be a registry key setting. I just don't know anymore... can someone please shed some light on my situation?? This one little thing is driving me crazy!