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#101
Turn off the computer, unplug all drives except the one you are installing to. When you get to 'where do you want to install windows', use the advanced options, delete every partition until the drive says unallocated. Next press the new button. Windows will create the partitions it needs, then start the install. Once you are booting OK with just the windows drive, shut down, reconnect the other drive, reboot and delete the partition on the second drive. Follow this Windows 10 - Clean Install - Windows 10 Forums