I installed ADE 4.5.1 on my PC. The install went smoothly. When I attempt to open ADE, nothing happens. I have uninstalled and reinstalled many times,,,,same result. I then reinstalled 3.0 and that opens just fine, but my books will no longer open. ADE only provides 3.0 and 4.5.1. Maybe a fresh copy of 4.0, which is not offered ADE. Any suggestions?