There are CD and floppy disk images in the Essentials/SmartBootManager of the LXF cover discs each month. You can use Linux or Windows to write these to a disk (use a floppy unless your computer has no floppy drive) then boot from it. If you have to use the CD version, wait for the menu to come up, remove the CD and insert the first RHEL CD, then select CD0 fro the menu.
"Insanity: doing the same thing over and over again and expecting different results." (Albert Einstein)