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David,
I tried renaming the Calibre2 directory and installing Calibre 7.26.0 again. What worked for me was using Glary Utilities Uninstall Manager. I uninstalled version 7.21.0 first. Then I used Programs and Features to uninstall Calibre 7.26.0. Afterwards I installed 7.26.0 again. So far, no problems! Thanks for your suggestions. And thanks to all for your contributions.
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