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The the only suggestions one can give for those facing such problems is to wait. Wait for a while a let the process finish. Apart from this, another suggestion is that if the upgrade seems sluggish, disconnect any USB devices and extended display cables that may be connected. This is expected to speed up the download and upgrade process significantly.
Was this an upgrade from Windows 7?
Other than 84%
what other text is displayed on the screen?
Did the upgrade complete?