Boot Error: 'error: no such device: grub rescue

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http://askubuntu.com – So I bought a brand new hard drive and put Ubuntu 12.04 on it. Then I decided to replace it with Windows 7, and I overwrote the entire Ubuntu partition. Now I am wanting to set up Dual Boot, but when I try to boot with the Ubuntu Live CD I get the following error: error: no such device: 3807.. grub rescue> Any help would be GREATLY appreciated.. I do not understand what is going on because I can not even boot the Ubuntu Live CD. Thank you so much! (HowTos)