How do I RE-install Windows 7 via USB

Steven_41

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Jan 20, 2016
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So a couple years ago i installed Windows 7 on my custom built PC via ISO on a USB. Now I want to reinstall windows 7 because I've bogged it down. If I try to go to BIOS and reboot via USB it just starts up my current installation of Windows 7. So I think I somehow need a W7 ISO with partition creation/deletion.

Any help would be appreciated!