A painfully slow laptop is very often caused by a failing hard drive -- and a factory reset does nothing to fix that problem, it only makes it worse.
Because you did the factory reset, Windows Update is now going to spend HOURS downloading and installing updates -- and that will drive the disc usage to 100% while it is doing it. I don't know why folks think a factory reset is the miracle cure, but it is not.
You will have no choice now than to wait until the Windows Updates are done.
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