Feather,
The new location for the "Stand - Alone Installer" is at http://www.adobe.com/devnet/digitalpublishing/
and not the one mentioned in the tech note. (The one in the technote is the old version, and I don't think the tech notes have been updated). Please make sure you are using that.
If you have used that then make sure you are launching the digitaleditions.exe in your "Program Files" directory.
If all of that doesn't work, I would suggest that you open up a support case (https://www.adobe.com/support/digitaleditions Click on "Get Support"), so we can get more system details and particulars from you.
--
Jim Lester
Adobe Systems