Unable to open ADE 4.5 and epub files

Question

I have a problem with Adobe Digital Editions (4.5.4) in Windows 10. When I try to open ADE, an icon appears on the taskbar with a blue line (showing it is active), but ADE does not appear on the screen. This happens however I try to turn it on, e.g. from the start menu, from a screen icon, or by right-clicking on an epub book in 'My Digital Editions' and telling the computer to open it using ADE. If I try to open an epub (e.g. welcome.epub) and hover over the ADE icon on the taskbar, a thumbnail of the epub appears, but clicking on it just makes the thumbnail disappear. When I then right-click on the ADE icon and tell it to close the window, a dialog box appears with the message (which I don't understand): "welcome.epub is not open from library, would you like to copy it to library?" I have tried uninstalling and reinstalling ADE.

Has anyone else had this problem? How can I get Adobe Digital Editions to open properly so that I can read my epub files?

Nanaky · Accepted Answer

No, this is the only ADE version I have.  I uninstalled the earlier edition when I updated to 4.5.The Version 4.5 has any problems. Better you uninstall it and install again 3.0.

Nanaky · Answer

Has you check it with right-click and run as admin?

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