have you tried the grub-install programme?
presumming your cd allows you to get to your linux files, then you can use it.
you might have to mount the files and use "chroot" to accomplish this.
also you can backup your MBR (where the boot loader lives) by using a command like this in linux:
dd if=/dev/hda of=/path/to/image count=1 bs=512
where path to image is a path and file name.
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