HOW TO MAKE USB BOOTABLE:-

1) hold the windows key and press the "R" Key
2) Write "cmd"
3) Press the enter key
4)write " disk part" And press the enter key
5) Type " List type" and press the enter key then the window will open with computer attach list in which two disks will appear one of them is " Disk 0" and other is " Disk 1'
6) Type "Select disk1" and press the enter key
                    clean
                    Create partition
                    Select partition 1
                    Active
                    Formate FS=NTFS
7) Usb formating will start. When formatting will complete then Type
                    Assign
                    Exit
8) Download this software " ULTRA ISO"
9) Insert the Windows Cd in CD or DVD Rom.
10) Open The My Computer and go to cd drive option and write click on it.
11) Go to ULTRA ISO option and click on " create CD/DVD image" write the name of this file( any name) and save this file on desktop.It starts creating the CD image.
12) Open this image, Open the "Bootable' tab  and click on write disk image then a window will be open
13) Open the "Disk Drive " barand select "USB Stick" path
14) check the "USB-HDD "writen method. When you click on write option then it will start to write the windows in USB.