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What can I do to stop the loud creeks from my wood floor before installing carpet? - installing floor into a boat

I want to put carpet in my room, on the old wooden floors. The bottom of the stream, according to some places. (50 years, wood floors), I drilled several screws on the wooden floor in some places to stop Creeking? Creeky do not want to have a carpet. BTW the floor is a mezzanine.