[Tools R Us]

If the rotors were significantly warped you would feel a pulsation in the peddle.

Did you lube the pads/hardware when installing? Most pad squeaks have nothing to do with pad composition, type or condition, it's the metal to metal contact with extreme pressure.

Get some "brake grease" commonly available at parts stores or can use any silicone waterproof type grease if you have some. Take the pads out and put a slight skin of grease on the places where the metal backing plate of the pad touches the caliper, I also put it on the pins, anti rattle clips, anywhere there is metal to metal contact. You want a slight skin, doesn't take much and only on metal pad and caliper parts, none on the composition part of the pad or rotor, if you get any there clean it off with brake cleaner.