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Your old PC might have had a HD starting to fail, thus corrupting the Calibre config folder, you simply brought the corruption over to your new PC.
Or
You got a Malware infestation.
IIRC You can NOT just copy Kindle or Adobe (files) to a new PC.
They are made specific to the PC on import (I tried restoring my Kindle stuff after a video driver issue faked me out. Not allowed, everything had to come from my Amazon account )
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