audible account password??

Help, I have bought several audio books from iTunes store last couple of years. Some how I have lost them in iTunes, I have them backup, but now when I try to drag them back to iTunes I'm asked for my audible account password and user name, after I enter it iTunes will not accept it, it tells me that the user name or password is wrong. I can log into my account and and see my account. I have only 1 account that I know of and it was used to buy these books as far as I know. I looked all over my account and can not find where I could of setup another account or password. How do I find out if I have somehow setup another account. I have checked under the Store tab in iTunes and it says that my computer is Authorized and under the Adavance Tab it only shows that I could DeAuthorized Audible Account.

Bill