How to make windows 7 bootable usb

Firstly you need 3 things:  a) 1 usb removable disk at least 4 Giga Bytes capacity
                                        b) windows 7 bootable disk
                                        c) Windows 7 usb dvd tool   download here http://download.cnet.com/3001-18513_4-10972600.html?spi=d9699e53f256282cedca0c7e412b84ba


Then you must plug in the usb into computer and place the windows 7 disk into the drive.Open the Windows 7 usb dvd tool and follow the instructions in the video below.