When trying to authorize my computer and new E-book with my Adobe-id I get the error: 'you can only authorize the computer by using an Adobe-id that has not been used before to authorize an computer or deveice, try again'

[rosep32918482]

Please help: When trying to authorize my computer and new E-book in Adobe digital editions with my Adobe-id I get the error: 'you can only authorize the computer by using an Adobe-id that has not been used before to authorize an computer or deveice, try again'. I don't understand, the whole point of the program is to link several computers and devices to my account. What am I doing wrong? Why does it ask for a different Adobe-id? Please help, so I can read my e-books on my E-reader! Thank you!