How to stop automatic continuous chacter input.

[NN49]

Suddenly Windows10 decided to continuously enter the character 5 [Numlock is ON]. There is no way I can interrupt it. So I cannot signin or do ANYTHING that requires entering keyboard characters ... including trying to RESET or rollback UPDATES, since all these options require you to enter some sort of password. There are no stuck keys ... this is Windows10 just taking off on its own.

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