Not sure what you talk about. Which boot loader are you using? I presume a linux bootloader, ie. grub.
When you have Ubuntu setup you can easily updated the entries for grub in (something like: ) /boot/grub/grub.cfg or /boot/grub/menu.lst (this is for grub 1.) You can edit this file and use the configurations you like.
In this file you should see every bootable configuration for the system, ie. a common ubuntu boot option, windows 7, and (probably ) a failover conifg for ubuntu.