The process is like this. Download Bootable USB Drive Creator Tool and extract the zip file. It includes two USB boot files (MS- Dos or Free-Dos) and an executable file. Insert a pendrive and run the exe file. Choose the options ‘Quick Format’ and ‘Create Bootable Drive’. Then browse the boot files (MS- Dos or Free-Dos) and click ‘Start’ button to create a bootable USB drive. That is all. Bootable USB Drive Creator Tool can be downloaded at here [via]