I have always been using the Windows 7 USB/DVD Tool http://www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool to create a bootable USB drives and it has worked fine.
By incident I ran into another tool called Rufus which is so much easier to use when creating a bootable USB drive, it has support for UEFI built-in as well which is great!
It makes life a little easier.
