I have several old books I purchased online in .pdf form. I bought a new computer, and have activated my Adobe Acrobat 7.0 Professional on it. However, I cannot open the books -- I get the message that I used different .Net accounts (?), and that I should return to the retailer that sold them to me. I am not sure who this is!
I do have one .Net account, but I am not sure about any others. I paid good $$ for these books, and am frustrated that they are useless to me.