error message when authorizing computer

I have recently been having all kinds of problems with ADE.  I have had ADE 3.0 installed for quite some time with no problems until very recently.  Long story short I ended up deauthorizing ADE, and then couldn't authorize my computer again.  I tried everything, uninstalling, reinstalling, rebooting, nothing worked.  Finallly went into my administration account and ADE showed as authorized, but when I tried to add a library book it told me it wasn't authorized, so I deauthorized in my admin account, and reauthorized and it worked.  Tried to add the book, and it transferred, then plugged in my Kobo Glo & was able to add the book to it as well.  When I change from my admin account to the one I normally use, the book I just added doesn't show, & ADE doesn't show as authorized.  None of it makes sense, but try running from your admin account and it may work for you as well.

The screen on the right is the error message that I keep getting.

"an error message" doesn't tell us anything.

Also, is this about Adobe Reader, or Digital Editions?