Im sorry to say but i think your keyboard is broken try use a external keyboard or on screen keyboard.
I had same problem after Re install Operating system my Keyboard is working properly. During the using of internet some time Virus Attack on your pc and Virus Insert in your PC App what every After do that you will solve it easily.
Its nothing to do with reinstalling windows theres something wrong with he's keyboard also it can't be a virus.
even I m change my os but the problem is still happned,,one thing I m not telling u that while i type the space bar ,both alt key is automaticale open ,than I m press Fn and F10,AND OPEN OSK[ON-screen key bord] type some word using mouse,than again the key bord work,whenever I m tuch onscreenkeyboard spacebar,, spacebar work,but while tuch keyboard space bar ,problem occaur again.....
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