[ubuntu] Help with Installing Grub

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http://ubuntuforums.org – I have really screwed up. I was working in fixing a second drive windows install so I could dual boot and somehow either deleted or made my linux boot non-functional. I am running on a 9,04 live CD (all I have) but actually have 12.04 installed on the hard drive. I have tried google searching this subject and have tried a few things, but they have all failed. I am at a loss of what to do. I have my life on the linux hard drive so cannot afford to lose it. I have a 12.04 live cd on a thumb drive but for some reason I am unable to get it to boot (tried all USB slots). Bios will recognize the (Hardware)