Digital Edition error message

  Several times I have installed and uninstalled Adobe Digital Editions.  I get the screen, but when I try to use it I keep getting the message:  “Error getting license.  Server communication problem:  E_ADEPT_REQUEST_EXPIRED”.   The time/date on my computer shows current date and time.  I have tried many times to install by using your site as well as my public library site and still get the same message.  Please tell me what I need to do to get it installed.