Create bootable USB Pendrive with out using any software or tools

1. Open command prompt from Start > Run > type cmd .
The Command Prompt Window opens, use the following command:
2. DISKPART and press enter
3. DISKPART > LIST DISK and press enter.
(After then you see the LIST DISK command, it shows the disk number of your USB drive.)
4. DISKPART > SELECT DISK 1 (The USB drive disk number is taken as Disk 1)
5. DISKPART > CLEAN
6. DISKPART > CREATE PART PRI
7. DISKPART > SELECT PART 1
8. DISKPART > ACTIVE
9. DISKPART > FORMAT FS=NTFS QUICK
(If your pc supports Unified Extensible Firmware Interface (UEFI), you should format the USB flash drive as FAT32, type format fs=fat32 quick, then click ENTER. )
10. DISKPART > ASSIGN
11. DISKPART > EXIT
12. At last save window all file in to the root of the USB flash drive.
(Open your window image file > copy all file > then paste in your pendrive)