The .iso files are CD images. You use them to burn a CD with a program like EZ CD Creator or Nero. There are ways, if you don't have a CD burner, to "burn" the images to a directory on your harddrive and install from there. However, a bit of advice. If you're just starting out with Linux, d/l the iso's to Linux-Mandrake 8.0. It's without a doubt, the easiest distro to get up and running if you're a newbie.
