I find Grub 2 in ubuntu 9.10 64 bit to be a real pain. First of all there is no utility available that will allow one to edit and and it shows up with multiples of the same os if you have several hard drives but only some are actually connected to that os.
When I had to reinstall windows 7 the grub would then not load but gave a grub rescue message. None of the parameters to recover grub worked nor did any of the instructions I used from several "help forums". Ended up having to fix mbr in windows 7. I will never use grub 2 again unless a utility is developed to recover it and edit the entries.