Windows 7 Home Premium and Professional same media?

"If you look at this article, there are ways to install any version from the media. It just requires changing one file and thus copying the media. So, the immediate answer is that you can't do what you want but with a little work you can.

I suspect the reason for this change comes from the way product keys are handled. With Vista you had to enter the product key before installing Windows. With Win7, you don't have to enter the product key up front. If users were allowed to choose what to install, they might choose ultimate and then find out 30 days later that their key is only for Home Premium."

"There are unofficial releases of media that can install any version of Windows 7 (32- and 64-bits, Starter through Ultimate) called All-in-One (AIO). These were created using the Windows Automated Installation Kit for Windows 7 and usually still require a valid license key (ie: they aren't pirated, pre-activated installations).

However, using official media, that isn't possible."