I've followed your instructions and uploaded to
sourceforge following the directory
structure.
1. Download grub4dos gui
2. Do not (Run "bootinst.bat" from the "boot" folder of flash drive) as in the original posting (to create a bootable USB stick). We'll sort that later.
3. Extract all files as instructed and extract hdm2.1.zip to root of USB stick.
4. Now using the file you downloaded in step 1 - follow these
instructions to install the MBR to get your USB drive to multiboot (**make sure you select the right drive to install the MBR to. Get it wrong and you could brick your PC!)
5. In the hdm folder, you will find C,E,F folders corresponding to the xbox's partitions. Copy the desired files to these folders.
6. Into the eeprom folder, copy eeprom.bin (note that filename is case sensitive)
Reboot and boot off usb and you should see the grub4dos screen.