ADE license error

Good morning,

two moths ago I was able to view my ebooks by using ADE. Now, after my PC has been repaired (motherboard replacement), I obtain several errors due to license/communication to license server.

From ADE I see my PC is properly authorized, but I'm not able to open any file.

How can I do to fix this issue and to return to the previous correct functionality?

Thank you and best regards

Matteo