Q. What is Windows doing when it takes so long “Working on updates” during a restart? (via Quora)
A: Software that’s in use and actively running cannot be updated or replaced on the fly. The in-use software has to be shut down, then replaced, then restarted.
When Windows Update needs to replace an in-use, system-level component, it waits for a system restart: At restart, the affected system components are initially inert and inactive, and so can be replaced before they go active and are in-use.
When there are many system-level components to update, the process can take a while. That’s when you see the “Working on Updates” notice.
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