Pretty sure I figured it out. Those who have the problem are opening epubs using the calibre "Open With" plugin, right? I see the same thing when I open epubs that way.
There's been an on-again/off-again issue with that plugin and Windows Environments/C-runtimes. Try opening an epub without using that plugin and see how it works (click the "Path" link in calibre and open the epub through the file browser).
Once we get that verified, we'll see what can be done about the calibre plugin.
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