SIC_WIT_IT

for a few weeks now i have been hearing a un-godly noise that comes from my driver side wheel . it only makes noise when i am going at low speeds. the noise sound like somebody's whisteling x100. it sucks cause i am over here in spain and all the chick love my car but when i go to stop and say "hola, como estas?" my dam brakes **** block me ... there is and issue i am concern with...when i took off my wheel last night i noticed there aren't and screw heads on the rotor just studs...i took the caliper off replaced the brakes and the rotor just fell off. is this suppose to happen? ... is my **** warpped?? if so i got some new rotors i can put on but i am still missing screws....can anyone help me out??