Boot From Pen Drive

Follow those step One by One : 

The systems on which you want to install Windows 7 via the USB flash drive have to be able to be configured to boot from a USB drive. Most new systems have the capability to boot from a USB flash drive, and the operation can usually be configured in the BIOS or by simply pressing a certain key during bootup. You’ll need to check your specific hardware in order to be sure.

Now, locate the command Prompt shortcut on the Start menu, right-click on it, and select the Run as Administrator command. Then,

Step 1 :

Step 2 :

Step 3 :

Step 4 :

Step 5 :

Step 6 :
*For  Format fs=fat32

Step 7 :

The USB flash drive is now ready. At this point, you can use the Exit command to exit the DiskPart environment and then close the Command Prompt window.

Step 8 :

Copying the Windows 7 files is easy. Just open Windows Explorer, access the Windows 7 DVD, select all the files and folders, and then drag and drop them on the USB flash drive icon. Keep in mind that the copy operation will take a little while to complete.

Step 9 :

Just boot the system from the USB drive and the installation procedure will begin as it normally would, However, the installation procedure will actually run quicker off a USB flash drive since it doesn’t contain any physically moving components.

& Now Your job is DONE .