Windows 10: find out of Windows 10 was upgraded to clean installed

  1.    26 May 2016 #1

    find out of Windows 10 was upgraded to clean installed


    I would like to know if there is any way I can find out if on a computer its Windows 10 was upgraded or came from a clean install. And if I can find this out after the 30-day period in which you can still go back to your previous operating system.
      My ComputerSystem Spec

  2. philc43's Avatar
    Posts : 3,590
    64bit Win 10 Pro ver 1809 Build 17763.1 and W10 Insider Build 18252
       26 May 2016 #2

    Have a look in the registry within the HKEY_LOCAL_MACHINE\SYSTEM\Setup.

    There will be entries for Source OS if you upgraded.
      My ComputersSystem Spec

  3.    26 May 2016 #3

    You can also run showkey plus from this forum. If it was upgraded it will show you the original OS product key. If it is a clean install, original OS product key will be blank.
    Showkey - Windows 10 Forums
      My ComputerSystem Spec


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