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#41
You should be using the ISO download and tool from Clean Reinstall - Factory OEM Windows 7. If this is a UEFI install then use UEFI Bootable USB Flash Drive - Create in Windows Option One. You should delete all partitions during install either way.
Those steps will assure you get and keep a perfect install, for as long as you stick with the tools and methods given. Is there some reason you can't follow them?