My ebooks are missing

My computer that Adobe Digital Editions was on with all of my textbooks died. I purchased a new computer while setting up I downloaded digital additions on the new computer, I logged in, I have authorized the computer and none of my books are there. How do I access my books. I have 3 years worth of textbooks on there,Please help, I went to the chat and the guy couldn't figure it out and sent me here. While I was here he logged off.