I downloaded the anniversary update on two laptops. One fairly new works just fine. The other is a few years old and was running fine with Win10, but slowed to a crawl after the update. It used to boot to the desktop in about 10 seconds (SSD helps a lot!). After the update, it took about two minutes to get to the desktop with most of the time spent with a blank screen. I contacted Microsoft and went with a chat session with "Steve" whose typing indicated English was not his primary language. He suggested a few things that did not help and then asked to remotely access my computer. I declined and asked him to walk me through the process in case it occurred on my other system that hadn't downloaded the update yet. At that point he told me the problem was that my CPU was operating at max and I had a virus. I exited the chat session at that point. I knew my CPU was not overtaxed and I knew I had no viruses.
So I used the option to revert to a prior build of Win10, before the anniversary update and the system boots normally and is quick again.
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"the difference between genius and stupidity is that genius has its limits."
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