Didn't authorize computer & now need to access e-book on different computer. Reset possible?

I'm very new to this & didn't understand the implication of not authorizing a pc before opening an e-book on it.  Now the SAT study guide I downloaded from the library, which I need for my teen, is on my work computer & not available to open at home. Is there any Adobe tech support I could call who could reset it for me? Or any other workaround? Time sensitive! Thanks.