First Boot from a live cd, mount the linux partition, add /proc and /dev and use grub-install /dev/xyz. Suppose linux lies on /dev/sda6:
# mount /dev/sda6 /mnt ------ mount the linux partition on /mnt
# mount --bind /proc /mnt/proc ----- mount the proc subsystem into /mnt
# mount --bind /dev /mnt/dev ------- mount the devices into /mnt
# chroot /mnt ---------- change root to the linux partition
# grub-install /dev/sda -------- reinstall grub with your old settings
# mount /dev/sda6 /mnt ------ mount the linux partition on /mnt
# mount --bind /proc /mnt/proc ----- mount the proc subsystem into /mnt
# mount --bind /dev /mnt/dev ------- mount the devices into /mnt
# chroot /mnt ---------- change root to the linux partition
# grub-install /dev/sda -------- reinstall grub with your old settings
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