Here’s how one use describes this problem on Microsoft’s forum:
Where did KB40387821 come from?
Strangely enough, KB40387821 is not listed in Microsoft’s Update Catalog. The Windows 10 Update History page doesn’t mention anything about it, either. However, users report that Microsoft deployed this update last week and, unfortunately, it brings issues of its own. As stated above, many Windows 10 Creators Update users reported this update wipes out all their programs. Moreover, after the OS installed this update, Windows 10’s Update History no longer lists the updates previously installed. KB40387821 is likely an upcoming cumulative update that wasreleased too early. If this update broke your PC, try uninstalling it and then restarting your computer. If this solution doesn’t fix the problem, perform a system restore or reinstall Windows. If you’ve encountered any other issues after installing KB40387821, tell us more about your experience in the comment section below. RELATED STORIES TO CHECK OUT:
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