As a wood floor ages, it shrinks and warps causing the floor to separate from the subfloor. Squeaks in the floor are caused by loose boards rubbing against nails or each other.
The best way to repair a squeak is to predrill up through the joist and into the subfloor into the squeaky spot if possible.
Be sure to put a piece of masking tape on the drill bit to mark the proper depth so you don't drill up through the top of the floor. Then, shoot a drywall or deck screw up into the floor. The screw should grab the plank and pull it down tight to the subfloor, eliminating the squeak.
If there isn't a joist in the area of the squeak, simply screw up through the subfloor into the plank. This method isn't as effective, but it may stop the squeak.
Unfortunately, it isn't always possibly to get under a floor. In this case, locate the squeak and drill a trim screw at an angle into this spot. You could use finish nails, but they don't hold as well as trim screws do.
Countersink the screwhead and fill any holes with wood putty.
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