Changing the springs never did much for me. The anti-squeal compound, applied correctly to the backside of each pad, can do some good.

Another shade-tree trick is to take a flat blade screwdriver and using considerable pressure, nick a line in the rotor from the center straight towards the outer edge. Do this about three times, equally spaced around the rotor, inside and out. The break in the smooth surface will remove the glaze from the pads allowing them to re-seat and hopefully stop the squeak. I did this once and it worked reasonably well. It's certainly a cheap fix.