I have changed my computer to a laptop and have had all my kobo book files transferred over. I have reinstalled Digital Editions which I require for me to read books on my Samsung e-reader. However, I cannot now open the books on my laptop as it states "authorisation is needed to a vendor ID and to authorise your computer to open this item enter you login ID and password associated with this item". I have tried everything I can but still fail to open the books. Can anyone help?