You need to boot from the installer to get Advanced drive tools for partitioning and formatting on that screen.
Is that what you want?
A Repair install and the Repair console are two separate things.
A repair install is run from the Windows 7 desktop, keeps everything in place but reinstalls the OS and reconfigures the boot as though Windows 7 was installed last so it can properly configure any multi-boot.
The repair console is on the second screen when booting into the Windows 7 DVD or Repair CD, select "Repair my Computer" it will find an installation to repair and then offer Recovery Tools to run Startup Repair, System Restore, Command Line, etc.
I believe you want to partition using the Advanced drive tools on the booted DVD, not repair. If you are concerned about losing the GRUB boot manager, I believe it needs to be deleted before Windows 7 install and then reinstalled afterwards. http://ubuntuforums.org/showthread.php?t=1035999