Wait, what good would booting from CD do if you don't have a hard drive?
Basically. If you have no hard drive, you can't boot from the CD. Booting from the CD can mean several things:
1. You can boot into Windows from the CD only if Windows is already installed on a hard drive. You would usually do this if you have a corrupted system file and repairing Windows won't work.
2. You can boot into the Windows setup and install it onto the hard drive.
Sadly, that's all I can think of at the moment. But, I was just trying to give you an idea of what booting from the CD means. So, correct me if I'm wrong. But if you don't have a hard drive. You don't have an OS.