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Are you sure the reader is authorized? Have you tried to copy the book to the reader inside of ADE?

No idea. I'm afraid you'll have to write to "El Corte Inglés". BTW, can you read it at the PC?

Yes, but if you read the post, it says that you connect the reader BEFORE opening ADE (my previous post was a mistake). Anyway, if it doesn't work, change the USB port and, if it doesn't work either,...

I suppose you have seen this link:

http://ebookreadersoftware.wordpress.com/2011/10/03/how-to-authorize-your-ereader-for-adobe-digital-editions/

If it is like my old reader, you should connect the reader to the computer with ADE started. A pop-up should appear asking about authorizing the device.