We've all been there. We've been absent-mindedly playing a game, unaware of the danger that lurks in the task bar, blinking, DEMANDING its due attention. You ignorantly refuse, only for it to jar you out of your stupor and bring your gaming session down around your ears. Your progress lost, your multiplayer match forfeited, you watch in impotent rage as the percentage ticks up, slowly, while telling you not to shut down your system, as if to taunt you. You don't know what it's installing, but it's irrelevant. You have lost, and Windows Update has won... but the question is, when was the last time this terrible fate befell you?
I personally just lost about 30 minutes of progress in KotOR2, including a bunch of character interactions. Minor, but still irritating.