1. Download Windows 7 USB/DVD Tool 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