Spring-loaded house windows have a spring located on the sides of the window in the window's track. This spring helps to move the window up and down. At the bottom of the spring is a track insert that puts tension on the spring. When a spring-loaded window is down, the spring is fully extended. Over time, the coil can loosen from the pressure and weight of the sash and become unbalanced, leaving you with crooked windows or windows that have problems opening and closing.
Clean out the window track by brushing it out with an old toothbrush. Dust away debris with a clean cloth.
Open the window so you can see the track insert. Locate the adjustment screw on the track insert.
Tighten the track insert's screw with a screwdriver by turning it clockwise if the window is too lax and falls down when opened. Untighten the track insert's screw with a screwdriver by turning it counterclockwise if the window is too tight and hard to open. Repeat on the other side of the window until the window is balanced.