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How can I tell whether the current windows installation was ugpraded from a previous version or edition? Does the registry or filesystem have data that would tell me?

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There is a key called MediaBootInstall in the registry under HKLM/Software/Microsoft/Windows/CurrentVersion/Setup/OOBE/, which is set to 1 if you do a clean install via DVD/ISO and the value is 0 if you do an upgrade.

  • Any registry entry that tells the version of the previous OS? – JJS Jun 9 '15 at 17:34
  • not that I know of. Look if the Windows.old folder was not deleted. Here you can look at the file versions of Windows files like Explorer.exe. – magicandre1981 Jun 9 '15 at 17:52

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