Here's the Web address for the blog, which I hope you'll continue to visit daily: http://www.pcworld.com/column/hassle-free-pc.
Now, then, on to business...
For the past couple weeks I've noticed that whenever I shut down my PC, Windows installs updates. Or at least appears to install them.
Typically this happens only once in a while, not every time. So I checked Windows Update to see which updates were in the queue. Then I shut down, rebooted, and checked it again: sure enough, those same two updates were still there -- they hadn't been installed at all. Or perhaps they had, but something inside Windows wasn't recognizing that fact.

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