reinstalling

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    Uninstall windows 10 (from upgraded windows 7) with option to reinstall later?

    If you wanted to uninstall Windows 10 from a computer and use another os but still have the option to reinstall windows 10 at a later date, what do you need to do before uninstalling to retrieve the cd key etc. (where the windows 10 install was an upgraded windows 7 retail). What's the simplest way?
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