While it is not exactly a clean install, it does guarantee that you only have Vista codes on the machine.

First, you install Vista without the product key. This will effectively put Vista in the evaluation mode, where you have 30 days to play around with it. Then, install Vista again over the existing copy. This time, type in your product key, this will install Vista into your system again. After that, delete the “windows.old” directory which contains the old installation of Vista.

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