If you ever need to run a DOS utility (eg. to flash a BIOS or a firmware), and want to painlessly create a bootable DOS USB key from Windows, this is for you.

Grab yourself a copy of Rufus from here http://rufus.akeo.ie/

Rufus is an utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.

It can be especially useful for cases where:

you need to create USB installation media from bootable ISOs (Windows, Linux, UEFI, etc.)
you need to work on a system that doesn't have an OS installed
you need to flash a BIOS or other firmware from DOS
you want to run a low-level utility

Despite its small size, Rufus provides everything you need!