I don't remember it downloading an update but normally it does this when it updates, so maybe one was d/ling in the background? I restarted the laptop because it was running slow and normally that fixes it. But this is the longest time it's ever been hung up.
Ctrl + Shift + Escape is the new task manager combo. Ctrl alt delete brings up a list of things that includes task manager but that might not work mid-update because it's the same window.