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Insert the USB drive into the computer you want to install Windows on. Navigate to the Boot menu. Switch the boot order. Save and exit the BIOS.
Boot or reboot the computer. When the computer reboots, you will need to press the Setup key in order to enter your BIOS to change the boot order. This will allow you to boot from the USB drive instead of your hard drive.  The Setup key must be pressed when the manufacturer’s logo is displayed on the screen. This is typically a very short window of time, so if you miss it you will have to reboot and try again. The key varies from computer to computer, but will be displayed on the screen when you can press it. Typical keys include F2, F10, and Del. While each BIOS layout is different, they will all typically have a Boot menu, though it may be worded slightly different. This menu will display the order in which the computer will look for a bootable operating system. Typically, computers are set to boot from the hard drive first so that the installed operating system loads automatically. Once you have found the Boot menu, you will need to switch the order so that your USB drive is listed at the top. Again, this will vary from computer to computer. Some BIOS setups will list the USB drive by its name, while others will simply say “Removable Device” or “USB”. You will typically use the “+” and “-” keys on your keyboard to swap around the boot order. Once you have changed the boot order, save your changes and exit the BIOS. The key for this is typically F10. The computer will reboot, this time booting from the USB drive first.