Rufus

Rufus is a small utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.  This free utility can be used in Windows XP and all later Windows versions such as Windows Vista, 7, and 8.  It can be used in both 32-bit and 64-bit Windows editions.  Rufus is portable and does not require an installation.

rufus

http://rufus.akeo.ie/