Disclaimer: I neither have nor wish to get any experience with Windows 7 nor Vista. The following technique works with XP had has been reported to work with Vista. Don't see why it would not work with 7, but let us know if you try it.
If there's nothing you care about on the second drive, I'd just do a standard install, deselect the first drive at the disk selection stage, let the anaconda installer remove alll partitions on the second drive, do a default install using the second drive only, and overwrite the MBR on the boot drive with GRUB. In the installer the Windows install should be detected and a GRUB entry "Other" created. I usually change that to something more descriptive, and you can make it the default by selecting the appropriate check box in the GUI installer.