Fixed it!
Maybe it's simply coincidental, but I deduced from the Sublime Text error message that maybe Java was something to do with it, since Sublime Text was not behaving properly, either.
I uninstalled Java, downloaded and installed the latest Java for Windows, restarted my computer and now both Calibre and Sublime Text are behaving properly.
So it looks as if the problem was to do with my installation of Java.
Thanks, everyone, for all the help.
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