It's like throwing darts blind-folded after you've been spun around, you might hit somewhere on the dart board, you might hit the wall, or your might hit your friend in the face (the dart board being the safe zone in this analogy). at what percent do you warn your client that shutting down your computer while this update could corrupt windows or any file being saved for that matter?It's the same type of thing when you're saving data to a game, if you turn off the console while the data is updating the file, it could cause the bits of the data to become incomplete rendering your data unusable or corrupt. what about .01% chance of file corruption, I would still warn my clients.It did worked but my Windows Update is now stuck with an infinite loading green bar. Unlike before, the older error forces me to restart my computer. However, I've encountered a newer one: Rather than looping on the check for updates, it only loops for "downloading updates".This one doesn't force me to restart, but rather wants me to wait for an infinite loading time of an update check. The installation of one or more Windows updates is probably stuck or frozen if you see one of the following messages persist for a long time: is all you'll see on the screen.
I would restore to factory settings when you get it back on, and then go through the updates again.
First thing The if you shutdown the machine, You can read this section for updating os , If your update is optional update the system wont crash.
If the warning is just a caution with no harm done if I power down the machine, how does the update process do this?
Now the question is, what is the likelihood of that happening? I think it's more of a if there's any possible chance this could happen, warn the client regardless. This Might Serve as an answer : The OS Upgrades during installation puts a message “Do not shut down your machine”.
But to answer your question, i think the likelihood is very slim with newer operation systems, and more likely with older operating systems like XP. If I shut it down the machine become unusable and I have to reinstall the OS?