Windows 10 Update 1709 aka Fall Creators Update has broken fullscreen gameplay. Using Alt+tab during game play, or just closing the game from in-game menus will cause computers to lock up on a black or blank screen, forcing users to hard restart (hold power button until shutdown) to recover.
If you do not have Update 1709, DELAY IT NOW!!! (windows update settings, select delay updates)
If you already have 1709, all is not lost:
After many hours of the Googles and trying 147 "fixes", the only one that actually works is to play in WINDOWED or WINDOWED(borderless) mode.
Microcrap has acknowledged the problem and is "Working" on a fix. Until then delay the update or play games in windowed mode.