You will have to change your "boot sequence" in your BIOS from "A, C, SCSI" (or whatever it is) to "CDROM, C, A" (it may be different, but make sure the first one is CDROM). Then have the disc ready in your drive, reboot, it will detect the boot sectors on the CD and say "bootable CDROM detected, blah blah blah" and then it will use the boot sectors. Then the familiar setup screen will show up, and the sequence of screens will guide you through the rest.