DigitalEditions - I cannot de-authorize my computer because I get "Unable to erase authorization. Please try after some time." Even after uninstalling and re-installing.

DigitalEditions - I cannot de-authorize my computer because I get "Unable to erase authorization. Please try after some time." Even after uninstalling and re-installing. The reason for attempting to de-authorize and re-authorize is because I get another error "Error! Check Activation" after installing the latest revision of DigitalEditions and when trying to read/open a book.