EditionID from “HomePremium” to “Enterprise”.Under ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion modify the following keys: Upgrading from Home Premium was possible, but I had to make the following registry changes first: Activating Windows 7 was easy enough, simply use the phone activation wizard, call Microsoft’s toll-free number and enter in the 8 sets of digits to receive an activation code. I found a way round both these problems which I share in case it helps anyone else. Windows 7 Enterprise would refuse to do an upgrade from Windows 7 Home Premium, insisting on a clean install.Windows 7 Home Premium refused to activate after doing a clean install on the new laptop citing not being an upgrade (as I had wiped XP first).Then I wanted to upgrade my work laptop to Windows 7 Enterprise which is offered by my workplace. I wanted to move the Home Premium license to the new laptop. I had already bought and installed Windows 7 Home Premium on my work laptop. I got Hannah a new laptop which came with the rather long-in-the-tooth XP installed. Pak Keung Wan on Is there a good place for sushi in Birmingham?.Patrick Ramsey on Chilli Bean Paste – Taste Test.