A quick Google search led me to this http://www.noobslab.com/2012/10/installrecover-grub-from-linux-live-cd.html
. Since you don't have an internet connection (remind me how you're posting to an internet forum?) I'll humor you. From the above site:
First of all Boot your Linux Live CD/USB then open Terminal and enter following commands:
This command for root permissions:
Check the drives number in Partition Manager :
sudo fdisk -l
Now select your Linux installed drive and change the number in following commands (Only change 'x' with your drive number) and change (sda) with your hard drive it can be (sdb, sdc, etc) you can see this in Partition Manager:
sudo mount /dev/sdax /mnt
sudo mount /dev/sdax /mnt/boot
sudo mount --bind /dev /mnt/dev/
This command will change mnt directory to root permissions:
sudo chroot /mnt
Now grub install command and Change 'a' in "sda" with your hard drive where you want to install grub, check in Partition Manager:
Now installation finished, Enter following commands to unmount (If these two command doesn't work, then leave them):
sudo umount /mnt/dev
sudo umount /mnt
Now reboot your pc:
Your grub is back. That's it.
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