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I had similar problem recently when I tried to upgrade W'7 to W'10 (from DVD) and after first w'10 drivers etc update.
Basically, something is screwed and computer became useless (however, I did the upgrade on cloned SSD so now I simply continue to use w'7 OS).
BTW, upgrade app from official MS website doesn't work on my machine (HP Compaq 6300) for some reason.
Perhaps you should try to do what is suggested - call MS for help (I didn't do this because I didn't want to pay for new w'10 license)
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