Not really surprised that confused you as it took me a while to think of how to word it and still failed.
The OEM version is the full version with some tech support options removed correct?
So I should be able to install Windows 7 on the SATA drive. When that is done, likely will have to wipe the original boot IDE drive, slave them, then transfer everything over to the SATA. At least that is the plan I have going on in my head to get rid of all IDE stuff and make some room.