Boot, as in reboot the computer and use a CD as a boot disc, or Autoplay?
If autoplay, all you need is an autorun.inf file on the root of the disc, that points to a program/file.
But you should have autoplay turned off anyway.
If you need a boot disc, then use something like Nero and go through the boot disc wizard. You'll need a bootable floppy or an image of one to transfer the files needed to create the boot disc.
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