You have got the wrong idea here - if you are booting from a CD then the OS installed on the hard disk has no bearing on things whatsoever.
The boot process is all in the BIOS up to the point that it finds a bootable device, so if you have the CD drive first in the boot order and there is a bootable CD in it, then the system will boot from it.
No drivers involved (at least not at the windows level).
SD