I just had to come on here and vent. I had been playing Civ 5 for a few hours and was just about to save the game and shut down for the night when all of a sudden the game shuts down and I get a weird error message. It turns out Microsoft update had downloaded updates in the background and begun restarting the computer! I don't really save often in Civ V because it has always been stable, so my only hope is that there was a recent autosave. But come on, why would you have a computer restart when the user was running other programs at the time?