I have a laptop I used to use for college that was Ubuntu 10.4 /Vista / Win7.
I pulled it out and proceeded to install 12.04 advanced partitioning.
It was sda1 ubuntu / swap / vista / and sda5 win7. I deleted the ubuntu, swap and vista, leaving 7 alone.
I'm using it now but can't get to win7. I used fix-boot several times using variations on the advanced menus. So I finally purged grub and forced grup-pc in the advanced setting of fix-boot. Here is a link to the report; http://paste.ubuntu.com/1225051/
I'm sure there is a way to edit the grub to get 7 to show as a boot choice and hope someone can point it out for me.