1 drive, 2 partitions. There is actually a 3rd partition, D:, that contains all my files and media. When I installed the Win7 beta, I shrunk the D: partition and created the F: for Win7. Now that I'm happy with the RTM, I want to do the opposite -- replace the contents of C with F, remove F and grow D back to it's full size.
I am not sure, but before anything always Backup your personal Data, Documents etc before proceeding.
Now, if you like to try I am not sure but you may try.
Download Gparted.
GParted -- Welcome
burn it to a disk or use tutorial for usb stick,
Set cd drive or usb drive for first boot option and hdd for second in bios,
insert the gpart disk or usb w/e you created,
Boot into gparted, Once in gparted you will now see all your partitions "if you only have the one hdd that were talking about".
Delete the C: partition, it will become unallocated.
Grab F: in gparted and drag it all the way to the left of D:.
Apply, it might take a bit depending how many gigs.
Edit:
After all proceedings , when you goto boot up it will ask for disk check, do not bypass it, let it do the disk check.
Edit:
After all is well, go back into gparted and expand D: to the right "resize"