Microsoft is running an unadvertised sale on Windows Vista. For the price of an upgrade edition requiring an existing copy of Windows, anyone can have a stand-alone version of Vista that will run on any PC. Indeed, the upgrade editions are full versions, simply waiting to be told to install themselves regardless of what OS is currently on the system, if any. The trick is all in how you interact with the setup program.
Microsoft MVP Marc Liron was kind enough to explain the procedure in this recent article, and we merely set about duplicating his results. Which we did, with an upgrade version of Vista Home Premium, Liron's instructions worked like a charm.
In short, all you need to do is delay entering your product key and delay validating your copy of Vista online until the setup is complete. For some reason, Microsoft has decided to allow users to install first and deal with the paperwork later. Simple in theory, although the details of exactly how to do this are a bit lengthy, and we strongly recommend following Liron's step-by-step instructions linked above. But, in a nutshell, all you are doing is avoiding the traps that MS has set up to cancel the upgrade installation if an authorised version of Windows isn't already present. If you dodge those traps, you can install a Vista upgrade on any machine, and later enter your product key and validate your copy normally.............
http://www.theregister.co.uk/2007/02/12 ... _everyone/
More details
http://www.instantvista.com/windows-vista-upgrade.html
