Landing of the stairs is making a creaking sound

Q: I moved into a resale house and noticed that the landing of the stairs (leading to the upper level) is making a creaking sound every time we step on it. I tried pushing talcum powder through the wood strips, but that did not help. How can this be corrected?

A: Gain access to the back of the stairway and secure the surface supporting the landing. You may have to apply shims.