It's a full version of Windows XP Professional, has autorun and what not so that you can install as an upgrade if you so choose, but you also can boot from floppies and install fresh. My hope is to use the slipstream tutorial to make a bootable version of the CD. I'm actually trying to install the OS onto a Virtual machine in Virtual PC so I don't have access to floppies on the machine and need to be able to boot from CD for a new installation.