How to convert USB into Bootable device?

Open command promt as administrator
1.DISKPART
2.LIST DISK
3.SELECT DISK 1
4.CLEAN
5.CREATE PARTITION PRIMARY
6.SELECT PARTITION 1
7.ACTIVE
8.FORMAT FS=NTFS
9.ASSIGN
10.EXIT
E:
(E is your dvd drive letter)
CD BOOT
BOOTSECT.EXE /NT60 G:
(G is your usb drive letter)
copy dvd contents to your usb.