SuperGRUBdisk should be able to help you reinstall GRUB. The menu system is a bit cryptic. You might want to look at this and modify it to your needs...
http://ubuntuforums.org/showthread.php?t=224351
SGD is great for letting you force boot whatever you've got loaded on your computer. I've had to use it to boot into an Ubuntu install and reinstall GRUB from there.
Hope this helped. Merry Christmas.