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How to change the registered name on a windows pc 
Review your system protocol. 
Registry editor allows you to make changes to system software and hidden files, which is what you'll need to do to edit the default username. To open the registry editor, go to run, type in " regedit ", and click " ok ".
This should bring up the registry editor, in which several folders should be viewable in the left-hand corner of the window. You may encounter a pop-up window asking you if you're sure you want to open registry editor.