Susan
The installer is flash program that is about midway down this page:
http://www.adobe.com/products/digitaleditions/
There should be a big brown button that says "Install" (or perhaps "Launch"), click on it and the install should start.
We have a current bug with the Windows install process, where if you are behind a firewall, the install will fail to complete, if that happens to you,
You can use the standalone installer, which you can download from:
http://www.adobe.com/devnet/digitalpublishing
--
Jim Lester
Adobe Systems