There is a way to upgrade Windows 7 Enterprise to Ultimate
Go to, Start, Run: and type: regedit.exe
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
Change the key : ProductName from "Windows 7 Enterprise” to “Windows Vista 7 Business”
Change the key: EditionID from "Enterprise" to “Business”
Do not restart
Now insert Windows 7 Ultimate CD and start upgrading (the option Upgrade will not be graded out anymore)
The same rule would also apply to Windows Vista too
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