Make Pendrive Bootable

Requirements:
At least a 4GB USB flash drive
Windows ISO File
Rufus tool software

Process:
Step1: Downlaod rufus tool software
Step2: Connect your usb pendrive and run rufus.exe.
Step3: Select the following setting in rufus:

• Device: USB(H:)  (THIS IS THE LOCATION OF YOUR USB DEVICE)
• Partition scheme and target systen type: GPT Partition Scheme For UEFI Computer
• File System: Fat32    
• Cluster size: 4096bytes (Default)     
• Check on: Quick format, create a bootable disk using, and create extended label and icons file.
• Click on: Small button near. (create a bootable disk using ISO Image) to browse and select windows 7 or windows 8 ISO Files.
• Click on start

When Task is completed (it may take some time) you will be able to see done in bottom left of rufus task manager. you are now ready with bootable usb pendrive to install windows7 or windows 8.

Installing windows 7 or windows 8 with bootable usb pendrive:

Now  go to CMOS options of your motherboard by pressing F2 or Del key depending on your brand and under Boot options, make booting from USB drive (it may show the name of your usb pendrive) as the priority. then press F10 and then yes to save and exit. Your laptop will restart and installing process will begin.