[Lancaster] Grub Error

[Deepan]

Hi All,
I deleted my windows partition using live CD. Now
my machine won't boot into linux. It stops at the
grub prompt with the error operating system not
found. How do I reinstall grub using live CD? Or
should I boot into my linux operating system with
root, kernel and initrd option in grub and then
install grub ?
Regards 
Deepan 
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