Installing Operating system with Only A USB Flash Drive

What you need:

• 4GB+ USB flash drive.
• Windows PC.
•  ISO file of your favourite operating system for example  windows 7 /vista  /xp or any linux distribution.

UNetbootin

• Download UNetbootin from http://unetbootin.sourceforge.net/ for windows and install it.
• Plug your USB drive into your PC.
• Format the USB drive to FAT32. Note: this will delete all files on the flash drive.
• Open UNetbootin and choose diskimage.
• Select the  ISO file for example iso file of your windows 7 operating system.
• Select your USB drive to create a bootable windows 7 operating system or any other of your choice
• Now when you plug your flash drive into any computer and turn it on, you can boot off the flash drive. If it doesn't do this automatically, open the computers boot options at start up. Usually you can access this screen by pressing esc key when its booting up. Select your USB drive and install windows 7 operating system or any thing of your choice.
• Good luck installing new operating system.