What you want to do is uninstall ADE 4.5.7. You don't want that version. What you want is ADE 2.0.1. ADE 4.5.7 might download ePub that has a new version DRM. You cannot remove the DRM or use the ePub on your Reader. Here is the link to ADE 2.0.1 from Adobe.
http://download.adobe.com/pub/adobe/..._Installer.exe