Acer laptop not working properly [Closed]

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Accidentally I pressed functional Key along with f4
Then onwards my Acer laptop not working properly and in Google Chrome a tool bar is appears then my for two to three minutes My system is not working
How could I resolve it?

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Please explain what you mean by functional key?
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Fn Key with f4 Was pressed
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Fn Key with f4
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F4 is a function key! (F=function) Look at your keyboard, there is no such key as fn.

What combination of keys have you pressed?

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