How to create Windows 7 / 8.1 /10 bootable DVD or USB Pendrive

                  1- Open cmd

     
           2-Type diskpart

            3-YES

           4-Type list disk

5-Choose your disk (see your disk size & select easily)
                  select disk 1   (0 /1 / 2)

6- then Clean

7-Type create partition primary 

8-Type  select partition 1

9-Type active 

10-Type format fs=ntfs quick

11- Few second wait

12-Finally type assign and exit

Note:- Check the your USB pendrive is Bootable yes/Not 

                - Goto  Disk Management see the your disk is active or not. when disk is active then confirm your disk is bootable otherwise.