Originally Posted by petercreasey
I de-authorized the dying PC from Sony Reader Library before it met its demise.
Does it still have to be de-authorized from ADE?
I think so. If you ever get an error that you reached your limit, then you can always call Adobe at that time. Sony can also help you too. There is some information here:
There's not much specific info in the FAQ about how to deauthorize your computer.