Rufus application is very easy to use does not requires any additional technical knowledge to create bootable USB pen drive. To create bootable USB pen drive, just insert pen drive into system USB port and start the Rufus USB bootable maker. Make sure your pen drive must have minimum 4Gb capacity to create bootable of Windows Vista, 7 or Windows 8. After that choose the inserted USB using Device option in Rufus application. Select the file type and enter the label any thing that you want like Windows 7 Bootable USB. Finally, locate the ISO image of any operating system that you want to burn into USB and press the Start button. It will take less time to burn ISO into USB pen drive than all other popular bootable making utilities.