With the help of a small program (Rufus), and a bootable ISO file, you can create a bootable USB flash drive (or USB stick). This flash drive can be used to start the computer and install a new copy of Windows from the USB drive instead of a CD or DVD disc.
Set your PC's BIOS to boot from USB.
Download Rufus:
http://adf.ly/17068857/rufus
Windows on USB Flash Drive
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