Here are the five simple steps that you need to follow to create a bootable USB flash drive to install Windows 7 from USB device:
Note: You need a USB flash drive with a minimum of 4 GB of free space. And also please backup your data from USB first.
1. Download Windows 7 USB/DVD Tool from here and install it.
2. Run the program, browse to your Windows 7 ISO image using the Browse button.
3. In this step, you need to select your media type. As we are here to create a bootable USB, simply click on USB device button.
4. Select your USB flash drive from the drop down box and click on Begin copying button.
5. The Windows 7 USB/DVD tool will take a few minutes to complete the procedure.
6. You are done. Reboot you machine and start installing Windows 7 (Windows 7 installation procedure).