From the GRUB manual found
here, error 15 is:
Quote:
15 : File not found
This error is returned if the specified file name cannot be found, but everything else (like the disk/partition info) is OK.
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This is probably a configuration error that can usually be corrected fairly easy...if you can boot the machine.
Is your BIOS set to boot from the CD-ROM before the hard drive? Check that it is and, if not, change it. Then boot with your live CD and post the contents of /boot/grub/grub.conf (or /boot/grub/menu.lst) to this thread. There's probably something borked in that file that gives you the error 15.