Hiren's BootUSB

1. Download USB Disk Storage Format

2. Download Grub4Dos Installer

3.Run USB Disk Storage Format
4.Run Grub4Dos Installer
  4.1 Disk
  4.2 Refresh
  4.3 While disk (MBR)
  4.4 Install
5. Copy grldr and menu.lst (from HBCD folder) to the usb drive
6. Copy everything from CD(Hiren's BootCD) to USB Drive
7. reboot

References:
[1] Download iso http://www.hirensbootcd.org/download/
[2] http://www.hiren.info/pages/bootcd-on-usb-disk