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I have Windows Vista Enterprise (x64) installed on my desktop. Is it possible to upgrade this to Windows 7 Professional? I know I could do a clean install, but I really don't want to.

I've read that if you change the EditionID and ProductName values in HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion, you can make the installer think you are upgrading from a correct edition version of Windows?

Will this work? Is there anyway I can upgrade; I'd rather not do a clean install.

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This article describes all of the supported upgrade paths: technet.microsoft.com/en-us/library/dd772579(WS.10).aspx – BillP3rd Aug 27 '10 at 19:55
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Probably you can try forcing the Upgrade with the settings you've mentioned, but there's the risk of losing or damaging your entire OS setup (without the possibility of a roll-back).

There's a tool that Microsoft Provides for checking compatibility issues o your current OS installation. You should try it for having a clear idea of you situation.

Windows 7 Upgrade Advisor

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I'll probably just clean install, that would be safer. – Rocket Aug 31 '10 at 13:47
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