I don't know exactly how to de-authorize your old computer, but the instructions say to use the "control-shift-d" command when you are logged in to ADE. But, I borrow a lot of library ebooks, and I use a Kindle and the Overdrive app with my Lake County library card. It is very easy to use. Sumter County uses the Axis 360 app, which is not compatible with Kindle. The Nook is not compatible with anything, except if you want to buy books from Barnes and Noble. I would highly recommend that you buy a Kindle reader and get a Lake County library card. Using the Overdrive app, you will be able to download thousands of library books for free and it is very user friendly. Good luck.
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