@hidden.platypus - Assuming you install calibre in the default location (%SystemDrive%\Program Files\Calibre2) and if you start program with a shortcut, then check shortcut targets %SystemDrive%\Program Files\Calibre2\calibre.exe (right click shortcut, select Properties, it's in Shortcut tab->Target)
If all else fails uninstall and do a fresh install - you won't lose anything, but to be safe I would backup my libraries and configuration data first.
BR
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