another importing question
 

im trying to convert the files my friend is sending me so i can do a fly-by/through animation on it. He's origionally doing the model for the builing in A-CAD and when i try converting it to a .mb everything scattered all over the place. Im looking for a good free converting program that i can use to help fix this 'cause i hate trying do a humpty dumpty on all this stuff. please help... please? with a cherry on top?