Hi all. I used the Microsoft ISO tool thing to make a 8GB windows 7 install "disk". It all works fine and very easy. I installed Ultimate on my desktop and just went to install Professional on my notebook but it auto assumes I want Ultimate and only lets me install that. Not a problem I thought, I have read on here many times that I need to delete the efi file and then I can choose again. This is the problem, I can't find it! Is it a hidden file? What's the exact file name, and is this something the USB tool does? Any help would be great.