Note: We’re republishing this story from Sept. 6, 2019, because an update has added multiple-monitor support to FancyZones, which resolves one of its few outstanding issues. If you’re a fan of Windows ...

Imagine this—you're having a good day, your PC is running smoothly, and you decide to install a custom Windows 10 theme, but then all of a sudden things go wrong. Very wrong. As in, you find out your ...