A recovery USB drive is a separate, portable flash drive that your computer can use instead of your main hard drive to start up from.

Jesus Vigo shows you how to create bootable USB flash drives that are used to install just about any OS on your computer with the help of Rufus.

When the computer restarts, it should boot from the USB drive and automatically start the Windows 10 installation program. Now you can just follow the instructions to install Windows to your PC.