A little care is needed when making a copy of OS installation discs. Making a normal data copy does not copy the boot data and renders the new disc un-bootable. To create a bootable disc copy of a bootable disc using CDBurnerXP:
Put the original bootable disc in the drive. Use Copy Data Disc with the destination as your harddisk. This creates a bootable ISO copy of the disc.
Put a blank disc in the drive. Choose the Burn ISO Image option and use the bootable ISO created in the above step.