Better not to make these kind of jokes.
The problem with it is, that this become a self running item for so called specialists in forums. Most likely people who don't know anything but make never ending idiotic mass suggestions to people with real problems and leaf them after that suggestion alone with even bigger problems.
I am using calibre since a very long time and there was never ever a situation on any OS with calibre where a user needs to reinstall a OS.
PS:
Rebooting a OS in case of problems is always a good first step as modern OS systems / AV/Firewalls / programs more often make updates w/o asking or informing an user.
(Not only a potential problem for Windows systems)
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