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My guess: the windows update fucked up Grub. Happened to me once or twice in 20 years of dual booting. It is also easily recoverable.
I do remember like, back in the day, having a LiveDVD around that had all sorts of ‘recovery tools’, among them one that was a one-click “grub is breaked, pls fix” thing.
Only had to use it once or twice though.