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You may have read about, or even tried - trying a new operating system by booting from a USB drive.
The process of overwriting the USB with a bootable image is pretty straightforward... It's only a matter of double-clicking on an installer.
Restoring that USB stick to a condition where windows can "see it" and actually read and write to it is a much more tedious task.
This article will guide you through the steps of recovering/salvaging the stick, but will stop short of creating a Windows boot drive.
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For now (until I can finish this article) you can follow steps 1 through 4 found at:
http://www.computerhope.com/issues/ch001366.htm
Be sure to exercise caution as you could accidentally erase the wrong drive with this procedure.
Some primmer/primary information is found at:
https://tails.boum.org/doc/first_steps/reset/windows/index.en.html
This article will attempt to combine these sources into a user friendly set of instructions.
More reading: https://technet.microsoft.com/en-us/library/Cc766465%28v=WS.10%29.aspx (from Microsoft)