@BetterRed: I tried your experiment with the portable calibre -- it worked.
Now what? I suppose I could just stick with the portable version.
I am discovering other funny errors though: one Excel spreadsheet crashes;
random errors occur in Thunderbird.
You know what they say about cockroaches: if one cockroach runs out of your cabinet, expect more.
I'm going to go ahead and do a clean install of Windows 7.
I may try a repair install first as an experiment.
Thanks for your suggestions. I will post my results.
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