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Windows 10 Reset Failed - Can't Boot Computer
So my computer has been kinda laggy and running slowly so I figured I would do a clean reset of Windows 10. It noted that it would take hours, which was fine. However about an hour into it, it said there was an error resetting. It then restarted the computer however I can't get passed the "ASUS" start up logo. It goes black and then loops. I hit F9 but none of the options work for me - automatic repair won't work because it says my computer doesn't have an administrator and when I try to reset again from there, it tells me that "a required drive partition is missing." I don't have the greatest knowledge on computers, so I really don't even know what that means.
I've read that I might have to reboot from a USB - how would I go upon doing that? Is there something I can download on the Microsoft website? I don't have a key because the computer came pre-loaded with Windows 8 and I upgraded to Windows 10 for free last year. Will I still be able to boot from a USB?