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@hidden.platypus - Take a look at the %SystemDrive%\Program Files\Calibre2\calibre.exe properties - see attachment.
If its 1.37 then run it from there - what does it say at bottom left - 1.37?
If so then your problem is a shortcut - get rid of them and create new ones (or live without them - Pin to Taskbar/Start menu are better because they don't get hidden, moved, or otherwise interfered with).
Whilst you can have 32 & 64 bit installed there's no real point in doing so. If you want to have a version of calibre for trying ideas, plug-ins etc install the portable version. Portable is self contained whilst the 32 and 64 bit installed versions share the same configuration data and libraries.
I have a vague memory of someone finding Revo was too aggressive with un-installing calibre in that it deleted all/some configuration data. Given calibre itself puts nothing into the registry, tools like Revo etc are not needed. The only registry entries that are related to calibre are put there by the Microsoft Trusted Installer, and they're there so that calibre can be un-installed via the Control Panel.
BR
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