Me: Your computer has Operating System corruption.

Customer: What does that mean?

Me: *something, something potato chips* and the only fix is to reinstall Windows.

Customer: Well that's stupid! I need my computer! Darn Windows! Microsoft should pay for that reinstallation! What causes that corruption anyway?

Me: Well, any number of things, but it's mostly caused by a part of the update not downloading correctly, so when it gets installed it creates a hole.

Customer: So now hold on... could shutting the computer down during the updates cause this corruption.

Me: It could, yes. That's why they say to not unplug your computer or shut it down while running the updates.

Customer: I see. Cause yeah, I remember that I was angry when it said it had to do updates, so I shut it down.

Me: Yep, that would cause it.

Customer: Okay, reinstall Windows...