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Windows 10 update crashed OS
Hi. I am having a question and I hope I could get some help here. The issue is that I have installed windows 10 (just as anyone else) on 29th July and it worked smoothly, fast and robustly. Really, no abjection whatsoever. Then, yesterday, I had an update. I had noticed some kind of buffer-overflow so I checked in task manager, but there was nothing. I checked system update, and voila. I restarted the pc, but... the update was weird. It got 100% (have no idea how) and began reinstallation, again and again. Then it halted and when rebooted it showed "UNMOUNTABLE_BOOT_VOLUME" error, rebooted and started Automatic repair, but everything I get is a blink and a black screen. So, I am wondering and asking you could I get windows 10 ISO and start clean installation of OS and use my windows 7 Home Premium key for activation (MS claims that I could, but there is just so many issues regarded to this topic). I read that there are possible motherboard and hdd corrupt issues, and more, so... I am a bit worried.
P.S. Warranty or guaranty has expired during this year.
P.P.S Ubuntu works just fine and sees all files, otherwise I could not do anything
Any help is highly appreciated... Thank you.