How To Install Window By USB Flash Drive Without Software

Make Bootable Pen-drive of any Windows OS.
First we need to copy the bootsector from the Windows Installation DVD to the USB drive. But before that we need to format the USB drive and prepare it. So copy it to your local disk.
Start Command Prompt by typing CMD in the start menu and run it as administrator.
-Type DISKPART
-Type LIST DISK Note down the disk number (###) of your USB drive.
-Type SELECT DISK # (replace # with the disk number e.g. SELECT DISK 1).
-Type CLEAN  Type CREATE PARTITION PRIMARY 
-Type SELECT PARTITION 1
- Type ACTIVE
- Type FORMAT FS=NTFS 
-Type ASSIGN  Type EXIT
Now we will copy the bootsector from the original disk or file saved to your harddisk. If you have an image you will need to mount it using a tool like Slysoft Virtual Clone Drive. Now I am assuming that the drive letter for the installer disc is X. You need to open up CMD one again.
-Type X: 
-Type CD BOOT
- Type BOOTSECT.EXE/NT60
-Y: where Y is the USB drive letter.
Now that the DVD is setup all you need to do is copy the contents of the DVD to the USB Drive (or extract the ISO file).