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Download the ISO image (windows-zip) which is the first blue link.
Unpack the ISO image from the zip folder (simply open the folder and Copy/paste onto desktop or in a new folder)
Use your burning software to burn a bootable CDr disk using the ISO disk image (do not just copy the files).
Set your BIOS to boot from your CD/DVD drive first (before hard drive), put in the disk, and restart the machine. On some machines you will need to 'hit any key to boot from CD' within a few seconds or it will skip back to the hard drive. The program will start itself, let it run all of the tests, unless you get any errors. If errors, retest with one stick of memory at a time. Replace if/as needed.
You have to be a little bit crazy to keep you from going insane.