erase c

I have been trying unsuccesfully to erase computer authorization for me ereader, however it was set up with an old email address that I do not use anymore and therefore dont remember password. There is no way to reset or delete any of this old info and when I contact Adobe help they are not helpful only in reseting my current password for my current email address but that is not what I need help with.  I am so frustrated. I only want to read books and now I cant. They give me this forum so hopefully someone here can help.