REBOOT is a term used to restart the computer
What you are after is to wipe everything and to install XP, what you need to do is to set the CDROM as the first bootable device (settings are under the BIOS settings), then pop in the CDROM and restart the computer, during the installation, XP will ask you what to do with your hard drive, one of teh option is to FORMAT the drive (with FAT or NTFS , depend on your choice), when you choose this option, it will more or less erase everything on your computer and install XP fresh.
HTH
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