Rufus is the fastest and easiest way to create a bootable USB drive for installing Windows 7, 8, 8.1.
Start by downloading Rufus from official website : https://rufus.akeo.ie/downloads/
Double-click rufus to start.
Select the USB device to make bootable.
Select File System.
Cluster size, use default.
Enter a volume name.
To create a bootable disk from an ISO file, the ISO button must be clicked.
Select the ISO file on your system from the file explorer, and click the Start…