Acer Aspire notebook keyboard

I have an Acer Aspire notebook.
its very old and i had set a password on it. I do remember the password but my keyboard is probably not right with its settings,
I recall pressing some keys tp alter the keyboard and then enter the password and it would work.
So im hoping you know what that is.
As far as I recall it was something "Ctrl" + "Alt" + "Z" but it hasnt worked and im not sure if thats the thing.
Please let me know if you can help out !!

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