Unity games do not launch but supposedly the file is open in System according to error.

I built my game for Windows (I'm running Windows 10 Threshold 2) but when i try to run it, nothing happens, the cursor stays like this and nothing happens.

Another strange thing, the cursor is only like that when hovering over the explorer window. I tried to delete everything and re-build, but when i try to delete, and error pops up "The action can't be completed because the file is open in System. Close the file and try again."

Then I tried restarting explorer.exe, didn't change anything. I wanted to see if it was an issue with my game or with all Unity games, so I tried to start up another Unity game and the same thing happenned.

Thanks in advance. ~Gorro_Rojo