Adobe Digital Editions reader suddenly needs authentication

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I have been using ADE to read ebooks and then suddenly it won't download books and i can't open the already downloaded ones. I have uninstalled and reinstalled the program but did not work.  It won't accept my authentication ID and PW [they are correct]

and then when I put in my adobe ID I get the following message

I don't know what to do as I download books directly from my k-12 account.

any help would be most appreciated.

1. Re: Adobe Digital Editions reader suddenly needs authentication

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and I just reinstalled it again and got this message