You need to enter your CMOS setting in your BIOS setup. This varies somewhat with different systems. Some BIOS will tell you what
to press to Enter Setup. It ususally comes after memory is tested and the IDE channels and devices are found. Other machines you
press Delete or Escape or F1 or CTRL+ALT+ESC (check your computer manufacturer's website) when your BIOS runs. Once into the setup,
locate the Boot option and look for the devices and the ideal boot order is floppy (removable devices), then CDROM, then Harddisk
(or Primary IDE). Once the order is set, have nothing in the floppy and then the CD will tell you to press any key to boot from CD.
Within a few seconds if you don't press a key then the computer will look for a boot record on the hard drive.