To create a Pen Drive Bootable just follows the steps given below:

Step1- Insert your Pen Drive to the system. Please make sure that you dont have any important data in your Pen Drive.

Step2- Type cmd in search of start menu in system.

Step3- Right click to the cmd icon showing in the search and click on Run as Administrator.

Step4- Your command prompt is opened now. Type some command and follow the instructions.

DISKPART

LIST DISK

Here you can see the listing of your drive attached to your system. Recognize your Pen Drive in these drives. Suppose your pen drive is showing as Disk 1.

SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS= NTFS

(It will take some time, have patience)

ASSIGN

EXIT

You have done it.