I recently bought the family pack Windows 7 Home Premium Upgrade discs as we have multiple computers in our house that need the Windows OS on them. I started with my mother's iMac, which already had Vista running on a bootcamp partition. Worked wonderfully. My iMac (27-inch late 2009), however, did not have any other OS besides Mac OSX so I started Bootcamp Assistant. I created my partition just fine and popped in the Windows 7 64-bit Upgrade disc. It installed just fine as I left the Product Key blank and opted to start my 30-day "trial." I had heard a "double install" of Windows 7 is possible using the method (#3) shown here: http://www.winsupersite.com/article/win7/clean-install-windows-7-with-upgrade-media However, when I attempt to run setup.exe from the upgrade disc, it gives me an error message telling me that I can only upgrade from "Windows PE." Then it kicks me back to the desktop. Is there a way around this? Side note: I already attempted Methods #1 and #2 from that site. #1 obviously didn't work and #2 would hang on the restart after doing the Regedit and Command Line steps. I know I'm missing something obvious. I just hope someone can tell me what it is.