EDIT: The following is directed at ICE-Cube:
Not wishing to sound pissy, but are you sure that Erase and Install is there? I mean from a previous post you don't seem to understand the difference between Upgrade and "Archive and Install", so are you sure you're not mistaken here? When you install did you click the "options" to see what are available, or did you just do a regular upgrade?
Yes I am 100% sure. When you do the installation you would be able to see the few options, accompanied by a short explanation beside each option. Erase and Install is included. However, you need to click options to see those, if not the installer will presume that u would like to upgrade instead.