In my basement there is one light switch at the top of the stairs that controls 2 lights and doesnt effect any other light. There are also 2 other lights that are controlled by a pull string how do i wire the light switch to control all the lights?

Wire from one of the 2 lights that work by the switch to the other 2 lights. Disconnect the wiring at the pull chain lights and tie into the new wire and they will now work together. Remember to use wire nuts to cap off the unused wiring.

Russ