7 - Upgrade Windows 7 Professional to Enterprise

There is a way to upgrade Windows 7 professional to Windows 7 Enterprise that is not officially supported from Microsoft.

here are steps that you should take:

1. Create a .reg file and double click on that with following text.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion]
"ProductName"="Windows 7 Enterprise"

2. Insert 7 Enterprise DVD and launch it upgrade option.

[original article http://richardfleming.me/upgrade-windows-7-professional-to-enterprise/]