Let me try again.
My portable Calibre has worked for years in exactly the same way. From my external hard disk, I used to just copy the entire folder into any new laptop I got and click on the exe and it would just load up and get going. In fact, if I do exactly the same onto any other laptop belonging to anybody else, it works just fine and dandy.
This issue started after I tried installing the 64 bit version (WHICH IS NOT PORTABLE but writes to the Windows registry) onto my newest laptop.
Now even if I delete the entire portable folder from the laptop and then recopy my portable Calibre from my external disk again onto the laptop, I still get this same error.
This despite the fact that I cleaned my registry of all references to the 64bit version to the best of my ability using Geek Uninstaller.
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