this is usually a CD or DVD image. You can burn the CD/DVD with it then install from there, or use something like VirtualCloneDrive to mount the image as a virtual CD/DVD (it would add a CD/DVD drive letter on your computer and that drive would show the contents of the file as if it was a real CD/DVD): http://www.slysoft.com/en/virtual-clonedrive.html Setup and usage help page at: http://www.elby.ch/products/clone_dvd/manual/drive.html