According to the image posted, the D: partition is the ONLY "Active" partition on either drive and so would hold the boot files. Since the C: partition is to be the primary Windows 7 partition for future use, it might be wise to move the boot files to that drive. One way to do that is to first, mark the C: partition "Active" (right click on it in the Drive Management utility and select "Active"), then unplug the other hard drive, boot to the Windows 7 install DVD and do the "Startup Repair" as many as three times or until the C: Windows will boot correctly. Then it would be safe to remove the boot files along with the Windows files and leave the other data untouched?