Uninstall Kindle?

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I seem to have filled up my PC Kindle. I have hundreds of books on it, to the point that they won't let me add anything unless I delete something. Now I have found "Uninstall Kindle". What does that mean? If I do that can I just start over again? I'd like that.
Any ideas? I would like to start over on David Weber's books and maybe The Dragon Riders of Pern...

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