one of the control key on my laptop doesn't work when i press it singularly, and when i press it and the numbers or the letters together. However, it does work with the Arrow keys ( for moving from words, lines or para) and with shift key to select)

Its not a virus prob, as i have formatted my pc and reinstalled the windows . i checked it with a Key Checker software, and it also doesnt show that Control key. do u think its hardware prob and i should show the service center?

Please let me know, as the service center is very far from my place, and i want to be confirmed before going there.