First of all you need a ISO image file for boot USB Pendirve.
If you don’t have ISO Image file you can download here >> https://www.microsoft.com/en-us/software-download/windows10 (Note: Windows 10 ISO Image file).
Or You can make ISO image file form DVD follow this instraction How to creat ISO image file from DVD?
Windows USB/DVD Download Tool is best option for boot USB Pendrive. Download it here >> Windows7-USB-DVD-Download-Tool-Installer-en-US.exe
Another option if (Windows USB/DVD Download Tool) is not work then try this
Rufus.. Download it here >> rufus-3.8.exe