You know, sometimes, if you have, say, Microsoft Word with an unsaved document open and you try to shut your PC down, Windows will tell you that programs are preventing shutdown, and ask you if you'd like to cancel and go deal with the programs or force shutdown. That's a useful feature. It prevents careless mistakes that can have pretty big consequences.
However, my computer has been prevented from shutting down, lately, by file explorer windows. If, say, my Downloads folder is open, and I try to shut my PC down, it will tell me: "The following programs are preventing shutdown: Downloads" (or something similar). This happens even if Downloads is the only thing still open to my knowledge.
I cannot say for sure, but I believe this has been happening since I reformated to upgrade to Windows 8.1. What's wrong?
For reference, I'm using Windows 8.1 Professional, upgraded from a clean install of Windows 8 Professional through the Windows Store.