Some users have reported that one of this week's Windows 10 updates crippled their PCs, according to a thread on Reddit.
They fingered the KB4013418 update as the most likely culprit. That update was marked simply as "Update for Windows 10 Version 1607" in Windows Update, and in the accompanying support document, tagged as a "servicing stack update."
In Microsoft's parlance, a servicing stack consists of the executable file and associated libraries needed to install Windows and its updates.
The original poster, identified as "becketbw," complained that after applying the Tuesday updates, "My computer does not work. Chrome opens, most programs do not, i.e. Start menu, Steam, Control Panel, you name it. [And] I am not able to uninstall the updates."