How do you dual boot Windows 7/8 seperatly with GRUB?

Question

I installed the beta version of Windows 8 and re-installed GRUB. When I boot my computer and select Windows 7, I get the new Windows 8 booting screen asking to boot between either Windows 7 or 8.

If I choose Windows 7, my computer then restarts and I have to select Windows 7 again in order to boot into 7. But if I choose Windows 8 it boots right up. I understand I can choose which OS to boot by default, but I want my GRUB options to be the only way to choose between OS's. So my question is, how can I set this up so that when I click on Windows 7, I go there, and when I select Windows 8, I boot 8?

Answer 1

Simple answer is: You can't. Windows 8 uses a new type of bootloader, starting the operating system almost completely before asking you to select which to boot. It then reboots into the correct OS. In this case, if you select Windows 7 it boots into the Windows 7 bootloader and then Windows 7. If you select Windows 8, it reboots into the Windows 8 partition with the flag to skip the Windows 8 bootloader.

Weird answer: You may be able to uninstall or disable the Windows 7 and Windows 8 bootloaders, allowing GRUB to take sole control. This is not really an Ubuntu-related task though. Try asking someone at M$?