So a few days ago I installed the Fall Creators update on my system and everything works fine except when I shutdown my PC. Most of the times I'll get a message saying "This app is preventing shutdown". It eventually shuts down after 15" but it takes much longer than normal because of this. Also the app has no name, all I see is the default .exe icon. The first time this problem occured was exactly one day after the update. However the first time, it was "Task Host window" that was preventing shutdown but now it's just this random unnamed app. Does anyone know how to fix this? Do I have to do a system restore? Please let me know.