I would like to install Google Chrome OS on an old Presario 700 laptop that doesn't have USB boot support. Do you know of a way of installing Google Chrome OS from a CD like you would usually do for Linux installations?
To boot the Chromium OS on a laptop that doesn't have USB support, use the LiveCD called Super Grub.
A full walkthrough of what to do is found at:
The important thing to know is that it might not work for you. Success hinges on if your BIOS offers Grub the USB drive as a boot drive. As shown in the link, the USB might be set as the first or second boot drive.