This is a Draft coz I didn't proof it yet!!!

First of all when you successful boot with live CD

  1.  open terminal
  2. type "sudo grub"
  3. find the location via command "find /boot/grub/stage1"
  4. then put it with "root (hd?,?)" // ? = result from 3.
  5. finally type "setup (hd0)"

Ref. http://ubuntuforums.org/showthread.php?t=224351