Weatherstrip and caulk all cracks between the wall and the window trim, especially under the window sills. Replace broken glass and putty any loose window panes. Caulk around the moving parts of windows with a strip-away, non-permanent caulk during the winter. This type caulk can be removed easily in the spring.
When replacing sections of old galvanized pipe, use two smaller pipe wrenches to avoid twisting and jarring the rest of the pipes. Try to avoid excessive pressure or you may cause more leaks in joints down the line. When leaks develop, always inspect the rest of the piping. An entire section may need replacement, especially if the water pressure is low.