Section 1.2: Installing Windows Server 2003 from the CD-Rom
When installing Windows Server 2003 on a new computer from the CD-Rom you must boot directly from the CD-Rom. Unlike Windows 2000, Windows Server 2003 does not support booting from boot disks. Therefore, if your computer does not support booting from the CD-Rom, you must install Windows Server 2003 from a network share or from within an existing operating system.
Place the Windows Server 2003 installation disk in the CD-Rom and reboot the computer. During the boot process you will be prompted to "press any key to boot from CD-Rom". Once you have pressed a key the installation of Windows Server 2003 will begin.