Given that Calibre runs in safe mode, go to Taskmanager and then the Start-up tab and turn everything off from running. After a reboot, if Calibre works, activate one, reboot, and try Calibre again. Keep doing this until Calibre stops working. Then you'll know what's causing Calibre to stop running.
However if after you've disabled all in Start-up and Calibre doesn't run, it could be some service installed along with some program.
Another thing to try if you cannot find what the problem is is to uninstall your AV because some AV needs to be gone (uninstalled) to stop it's shenanigans.
Last edited by JSWolf; 01-03-2021 at 11:19 AM.
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