[ubuntu] Dual booter reinstalled Windows and needs GRUB2 back

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http://ubuntuforums.org – Hi, I'm a dual booter and I just re-installed windows but I realized that my GRUB2 doesn't load on startup anymore. My Ubuntu is still working and somewhere inside my C: drive. Its just that I can't access it now. Is there anyway to re-install GRUB2 to the way it was before i re-installed windows? Thank you! (Hardware)