How do I disable one key on built-in laptop keyboard except USB keyboard?

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Jan 6, 2018
I have trouble using my laptop keyboard.. When I typed C or pressed the down arrow button, it holds automatically... [Ex. cccccccccccccccccccccccc] But it stopped holding when I pressed other keys, I tried to disable the key using KeyTweak and it worked well but the problem is I can't press C on my USB keyboard. I tried to clean with hand towel on missing key buttons that my little brother smashed it like a drunk person... I might afraid if I pulled the whole laptop keyboard because my laptop that my cousin gave me 4 years ago... so, I have no idea to fix this problem but can you guys help me?

Version : Windows 7 Ultimate 32-bit, Samsung N102SP
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