Here are a few tips I found on preventing bird collisions with windows:Remove houseplants near windows so birds will not consider them to be shelter or food. Instead, position plants and flowers where they cannot be seen from outside. Hang sheer curtains over large windows to minimize reflections. Kept closed, these curtains can effectively reduce window collisions without significantly decreasing light and visibility.Break up a window’s reflection by adding decals, sun catchers, crystals, Mylar strips, windsocks or other obstacles outside. If these objects can sway in the wind, they will provide an additional deterrent. Birds will attempt to fly through any space larger than 3-4 inches, so decals and strips must be close together over the entire surface area to be effective. Allow windows to remain slightly dirty to cut down on the strength of the reflection.
  
Paint patterns on the outsides of windows with soap or tempera paint (which can be wiped off with a sponge but won't be washed away by rain). You can find stencils and tempera paint at art and craft supply stores.
Move bird feeders and baths either within 3 feet (too close for a collision to be fatal) of windows or more than 30 feet away (birds will be more likely to recognize that windows are a part of the house).Bug Screens year-round-you have modern dual-pane windows, you can leave screens up all year to provide cushioning if a bird hits the window.