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Use cmd command to delete files not used by win7 system to expand memory

  
Click the Start button, type cmd in the search bar, right click and select "Run as administrator" &


In the pop-up dialog box, enter “rd/S/Q c://WINDOWS. OLD or rd/S/Q $WINDOWS.OLD ”
When you are prompted to confirm the deleted WINDOWS.OLD folder, confirm the input y and press Enter.

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