Force boot to setup

... and I have tried to explain that Microsoft's instructions require a USB flash drive. The only other choice is a DVD. There's no option to use an external hard drive.

On the BIOS, I chose the USB as primary, and disabled the internal HDD.

That's not how it's done. I tried to explain.

I'm beyond the device selection step.

On the BIOS, I chose the USB as primary, and disabled the internal HDD.

In the command prompt from the recovery environment, I can navigate normally through the files from the USB.

So the USB is not the problem. The files from the extracted ISO are all there. Double checked.

The setup is simply being ignored (bypassed), and windows is using the USB to boot.

I want to reinstall windows, but when I boot from the USB, it runs the already installed system ...

That means you're not booting from the USB drive. 😉 But not to worry.

Every computer manufacturer has a particular procedure for booting from a USB flash drive. Generally, you have to interrupt the normal boot process by pressing a special function key, then you choose to boot from the flash drive. Your computer manufacturer will tell you exactly how it's done.

Hi LucasBS

I am Dave, I will help you with this.

The method to boot from a USB varies from motherboard to motherboard, click your Start Button, the just type msinfo and press Enter, please provide a screenshot of the resulting System Information window.