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What is telling you there is no format? Calibre or reader.
To actually reinstall calibre fresh you often need to delete the configuration directory.
Preferences->Miscellaneous.
Click open the configuration directory, Close calibre. Click Roaming in the explorer window and delete the directory named calibre. Then start calibre and it should make a new one with all of the defaults.
remember it is not beyond your capabilities as you have had it working in the past. I know it is stressful as I have been there and done that.
Helen
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