How to create Bootable Windows 7/8 USB drive

Download and install 'Windows 7 USB/DVD Download Tool' from Microsoft official store; link: http://www.microsoftstore.com/store/msstore/html/pbPage.Help_Win7_usbdvd_dwnTool, It is a freeware

Note: 1. For installation, read: http://www.microsoftstore.com/store/msstore/html/pbPage.Help_Win7_usbdvd_dwnTool
           2. It works for Windows 7, Windows 8, Windows Vista, & Windows XP SP2  

After the installation is complete, make a copy of Windows 7 or Windows 8 ISO file by following the inline steps:

1. Press 'Start' button and click on 'Windows 7 USB/DVD Download Tool' in the 'All Programs' tab
2. In the 'Source File' box, type the name & path of ISO file or click 'Browse' button to select the file from 'Open' dialog box and click 'Next'.
3. Select the USB device to create a copy of the ISO file

When the ISO file is copied onto the USB drive, restart you PC and go to BIOS settings to make the USB drive as the first bootable device.