i was trying to set up a bluetooth mouse and one of the devices on the bluetooth list i didn't recognize. i clicked it and i think it sent a number out to the bluetooth device to type in so it could link to my mac. after that i realized it was my neighbor's mac. does this mean all they have to do is type the number and they can get into my computer? all my photos went missing yesterday and i found the the iphoto file mysteriously moved to another folder with some other photos which i couldn't possibly have done myself since i haven't accessed that file recently. also just now i noticed that the "bluetooth file exchange" app is suddenly open. what should i do?