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Factory Reset leaves traces of previous users
I did a full Windows 10 Reset and loaned my machine to a Polish friend. When he returned it to me, I did a Full Windows reset including wiping the drive.
When the machine finished the reset process, the first Windows 10 setup screen offered me English or Polski(Polish) as a language selection.
There are files relating to the Polish language (and other traces of his activity) in the %WINDIR%\System32\oobe directory and in the registry hkey_user entries.
How do I erase all traces of previous users?