Just checking: have you tried this step?
Quote:
Kindle may need to be registered by signing in to your Amazon account within the program. Some users have reported being unable to sign in to their Amazon account within Kindle for PC once version 1.17 is reinstalled. If that occurs go to the Amazon website and on the manage your content and devices page, and on the "Your Devices" tab locate "Kindle for PC" (or Mac) and deregister it using the "..." "Actions" menu. Wait a few minutes for it to take effect and try to sign in again. (If all else fails then re-install and register again and start over with step 1.)
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