Can you access the registry from an old install of Windows?

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Of course. Using reg load command and then regedit, then reg unload

 

i think it will be better to do a reg hive backup of old before apply an in place upgrade .

 

I always thought the the Windows.old folder was only created if you upgrade Windows, e.g. go from Windows 7 to Windows 10, or if you upgrade from an older Windows 10 build to a newer Windows 10 build. If you do a clean install (is that what you meant by using the word fresh?), then you won't be finding a Windows.old folder afterwards.

 

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