Okay, I see this as a long shot. I had to completely reinstall Skyrim because it stopped working. Before then I had this fix for the mouse clicking outside the window and causing it to minimise and thus get the annoying black screen when trying to go back into the game. Basically it made alt-tabbing between the game and desktop pretty easy, seamless almost just like alt-tabbing between any other window. People have told me to use OneTweak but that wasn't the fix I had used and fortunately that just crashes my game. I've tried looking for where I found the fix but it was like 2 or 3 years ago and well I foolishly never bookmarked it just in case.