How-to – Upgrade Windows 7 Professional to Enterprise

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]
 "EditionID"="Enterprise"
 "ProductName"="Windows 7 Enterprise"

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