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Then (as its too long to explain to you here with so many illustrations that you can understand) look at this detailed, illustrated and extensive guide here: How To Do A Clean Installation Of Windows 10 | Tom's Hardware especially look under "Installation" and take particular note to points 6 and 7 this is especially in regards to "What type of installation do you want?" which is part of the Win-10 installation process, that should be "Custom: Install Windows Only (Advanced)" and you want to select Delete all existing partitions on the primary HDD until only unallocated space remains and the only remaining item shows Drive 0 Unallocated space. As this will give you a "Fresh Clean Install" and your total drive size and free space should be the same (approximately) as the size of the bare boot drive that you are installing into and have. Good luck