How to install Windows 7 on a computer that has no CD drive?

1. create an ISO image of Windows 7 DVD
2. download "Windows USB/DVD Download Tool"
3. install above tool on a Windows computer
4. run the tool and pick up the ISO as the source and an USB stick as destination to build the bootable USB
5. insert the bootable USB stick into the computer that has no CD drive
6. boot the computer from the USB stick