I had to do an upgrade of Windows Vista Ultimate to Windows 7 Enterprise today. While I made the attempt to upgrade this OS, I got an error message that you can’t do this type of upgrade. I am not saying that the Microsoft license legally allows this, but in this perticular case the original installation was done incorrectly and should have been Windows Vista Enterprise.
Here’s how to get past this message:
Go to, Start, Run: and type: regedit.exe
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
Change the Key “ProductName” from “Windows Vista Ultimate” to “Windows Vista Enterprise”
Change the Key “EditionID” from “Ultimate” to “Enterprise”
Now restart the Windows 7 upgrade. You should now be able to upgrade!
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