if you got the .iso, there's nothing to extract.
you're supposed to use cd burning software that will take an .iso file and burn it to the CD. I don't know the terminology and the details, but Nero does a good job of this. With Nero, open the .iso file and it takes you straight to the prompt to burn the CD. After you burn it, its just as good as the boxed set you buy for $200+.
You can get Nero Burning ROM from Kazaalite and most other file sharing services. Check out bittorrent as well, i've started using that. suprnova.org has a good selection of torrents and it too should have Nero available.