Has you install only one Verison of Digital Editoin. Sometimes are two version on a system cause this Error.
Yes. Only one version installed. Tried both 4.5 and 3.0 and either worked.
I am having the same issue..exactly.
Closed Digital Edition.
Rename the my Digital Editoin Folder under your Documents in My Digital Edition.old.
Start Digital Edition with right click and run as admin. Hope it helps by your problem.
I have the same issue on Win7 OS.
I used ADE 4.0 in this PC for several years now, suddenly few weeks ago ADE stopped to launch.
Nothing was changed in the PC except usual windows updates.
Tried to install ADE 4.5, run as administrator, etc. - nothing helps.
Renaming My Digital Edition folder also does not help.
There are some others with the same problem - see Adobe Digital Editions won't launch.
Strange o.O sorry but have no other idea....better you check to write directly a staff person. You has Staff under the name.