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Running cmd.exe with Administrator rights, I got the path C:\Program Files\Calibre2 - pls see below:
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The results tell you there is at least one calibre 64 bit installation that you can uninstall or update (as we know already
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As DNSB mentioned, you should really reinstall calibre. Download the actual installation from the official site
https://calibre-ebook.com/download_windows64
For the following action take care you user account have admin rights.
Uninstall calibre via control panel ->programs, boot your system (usually not needed but just in case...), make a new installation and allow all activities for calibre if there is a request from your security software.
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By the way, there was going something with what DNSB mentioned to you. The command "where" should give you a result, as there is an active installation. Maybe a typo or a restricted user account. You can check this if you like. Copy this one in your cmd window with admin rights and hit enter:
where /F /T calibre*.*
This should show you all files with time stamp and locations starting with the name calibre (usually 8 files).