[ubuntu] Grub/boot menu help

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http://ubuntuforums.org – I haven't ran Ubuntu since 10.04 and was dual-booting with Vista. I recently decided to upgrade both. The problem is that my boot menu still says Vista and Ubuntu 10.04 when it is really suppose to be 7 and 12.04. The normal solution of what I've done in the past was use the command /etc/default/grub and edit it in the text file. For some reason when the text file opens up it is blank.....and I also checked in file /boot/grub for the "grub.cfg" file but it isn't in the folder. I am really puzzled and just want to simply edit/rename the grub menu. Any help would be great. I installe (Hardware)