The purpose of this tutorial is to create a debian installer boot disk on a USB device (less than 64 MB are required) from windows.

1. From the debian site, download :
vmlinuz
initrd.gz
debian-503-i386-businesscard.iso (businesscard iso)

2. From the site http://syslinux.zytor.com, download syslinux-X.XX.zip (I have downloaded http://www.kernel.org/pub/linux/utils/boot/syslinux/syslinux-3.83.zip)

3. Extract the syslinux zip file on c:\syslinux

4. Insert your USB disk and retrieve the drive letter

5. Open a cmd.exe and type
cd /d c:\syslinux\win32
syslinux -f driver_letter:
exit

6. Create the syslinux.cfg file and add the following lines:
default vmlinuz
append initrd=initrd.gz

7. Copy tme vmlinuz and inird.gz and the iso files on the usb drive.

8. Eject your USB device properly, restart change your BIOS configuration to boot under the USB drive.