If you want to create a USB boot device without using 3rd party utilities then this is what you can do on a windows computer to create one:
Open up diskpart.exe
List Disk
select disk 1 (assuming that disk 1 is your USB device listed in the first command)
clean
create partition primary
select partition 1
active
Format fs=ntfs quick label="Windows"
exit
Now open up an administrative command prompt. We assume your USB device is D:.
(Ensure you are not rooted in your USB drive)
bootsect /nt60 d:
Extract the contents of your ISO to a folder - in this case lets call this c:\ISO
xcopy c:\iso\*.* d:\ /E /F /H
Open up diskpart.exe
List Disk
select disk 1 (assuming that disk 1 is your USB device listed in the first command)
clean
create partition primary
select partition 1
active
Format fs=ntfs quick label="Windows"
exit
Now open up an administrative command prompt. We assume your USB device is D:.
(Ensure you are not rooted in your USB drive)
bootsect /nt60 d:
Extract the contents of your ISO to a folder - in this case lets call this c:\ISO
xcopy c:\iso\*.* d:\ /E /F /H