Windows app and features update pop-up

[Windows 11]

A couple of days ago I had a pop-up that appeared to be a genuine Microsoft Windows 11 update for apps, security and features. I regretably clicked Ok.The PC continued to run normally, however, when attempting to boot up the next day. it failed with a message stating 'Missing operating system etc.' I tried booting up several times with the same result.I then ran Linux so that I could check the M.2 SSD boot drive in GParted (partition manager). This showed that two partitions were unmounted, and could not be changed. Thus rendering Windows corrupted.I suspected a hacking attack. I deleted all p

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