If it's a Norton disk, call Norton, it should be bootable. If it's a disk you burned, it may not be a bootable system disk. Make sure your computer is set to boot from CD/DVD drive in the bios (setup) Press F2(usually, sometimes it's delete) while booting, go into setup, and make sure under boot devices/sequence that your disk drive is first in the boot sequence. Try the disk on another machine to see if it's the disk, or the machine. If it's the disk, Call Norton (if it's theirs) or have someone make another one for you.
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If it's a Norton disk, call Norton, it should be bootable. If it's a disk you burned, it may not be a bootable system disk. Make sure your computer is set to boot from CD/DVD drive in the bios (setup) Press F2(usually, sometimes it's delete) while booting, go into setup, and make sure under boot devices/sequence that your disk drive is first in the boot sequence. Try the disk on another machine to see if it's the disk, or the machine. If it's the disk, Call Norton (if it's theirs) or have someone make another one for you.