step 0: format ntfs usb
step 1: put boot into usb (using bootsect.exe)
step 2: cp iso/* usb:
-- that is

in win7 run cmd (as admin)
 diskpart
 list disk
 select disk 2
 clean
 create partition primary
 select partition 1
 active
 format fs=ntfs quick
 exit

d:/iso/boot/bootsect.exe /nt60 new_usb_drive: (ex e:)

cp iso/* usb: