I have an adobe ID and password.

Subject:

I have an adobe ID and password.  When I tried to download a book from library, I got an error check authorization.  I removed authorization and book downloaded but I could transfer to e-reader.  I uninstalled Adobe Digital and reinstalled it and tried to set back my authorization.  It would not allow this saying my authoization had been used on another computer. What do I do now to get to use Adobe Digital??