1. A bootable pen drive with FreeDOS installed (no images used) and Grub4DOS to load any ISO image you want. Start with formatting the USB-Stick using FAT32. The first thing to care about now is Grub4DOS.
2. Grub4DOS Toolbox for Windows is a small utility that allows the user to install, uninstall and modify the Grub4DOS boot manager with great ease in Windows 2000 and above. It also performs some other related useful functions.

Grub4dos Installer 1.1 Zippyshare

Download GRUB4DOS - An application that was created in order to provide users with an easy to use and universal boot loader which is based on GNU GRUB. Grub4dos-0.4.4.zip main category: System.

Step 1
Connect USB Pen Drive (1GB or more)

Step 2
Download and Run USB Disk Storage FormatUSBFormat.zip (34KB)

Step 3
Download grubinst_guigrub4dos.zip (179KB) and Run as Administrator

Grub4dos Installer 1.1 Zip File

Step 4
Insert the BootCD (10.3 or newer) in the CD Drive and Copy everything from CD to USB Flash Drive

Step 5
Copy grldr and menu.lst from grub4dos.zip (or from HBCD folder) to the usb drive

Step 6
Test Your USB Drive (read bottom of the page for troubleshoot)

Make sure you set your computer to boot from USB Flash Drive

To Enter the BIOS press the 'Del' button on your keyboard. Alternatives are'F1', 'F2', 'Insert', and 'F10'. Some PC's BIOS might even require a differentkey to be pressed. Commonly a PC will show a message like'Press [Del] to enter Setup' to indicate that you need to press the 'Del' key.Some AMI BIOS require you to enable the option 'USB Keyboard Legacy support'!

For AMI BIOS:

• Go to 'Feature Setup'. 'Enable' these options: 'USB Function Support',
  'USB Function For DOS' and 'ThumbDrive for DOS'. Go to 'Advanced Setup'.
  Set the '1st Boot Device' to 'USB RMD-FDD'.
  Reboot the PC and it now should boot from the Usb Stick.
  
• Go to 'USB Mass Storage Device Configuration'. Select 'Emulation Type'
  and set it to 'Harddisk'. Go to the 'Boot Menu' and set the '1st boot device' to 'USB-Stick'. Exit the BIOS, saving the changes.
  you can try 'Emulation Type' to 'Floppy' or 'Forced FDD'.

For PHOENIX/AWARD BIOS:

• Go to 'Advanced BIOS Features'. Go to the '1st Boot device' and set it to 'USB-ZIP'.

Troubleshoot

If you cannot install grub4dos (or you get 'cannot run background program' message) then use syslinux to boot grub4dos