Hey, don't restart my computer for me!

This morning, when I arrived at my office, I expected to see my simulation completed. Instead, I found that my PC was restarted and part of the simulation was terminated and unfinished. As I logged in, a message arised from the lower right corner:"you computer was recently updated, which required an automatic restart". Hey! I know it will make my computer better but my simulation is also very crucial to me.