squealing brakes

replace front rotors and pads 4 weeks ago after 3 or 4 days they started to squeal and getting louder ,was told by parts store the were bad rotors,so i bought new ones last week from different place and again after 3 or 4 days they starting to squeal ,what should i do now to get rid of the squeal,, 2002 SE 76K

thank you great site

the first thing I'd be looking at is if the sliders were properly lubed. If the pads don't press evenly on the rotor than they'll chatter. I'd also look at the pads, did you get grease on them when you were installing them? A quick cleaning may be in order. I'd also clean the rotors and be sure to scuff them with some 120 sand paper to remove any shipping sealant that may be on the rotor.

P