Freezing

Hello! I have FlightGear v0.9.10 which is downloaded here at flyaway, But after sometime of using it FlightGear many times freezes on the loading scenery objects part whenever I load dawn or dusk, But FlightGear still works well if I set to Day. But when I load Dawn or Dusk it freezes and after a while the screen becomes blue and says: A problem has been detected and windows has been shut to prevent damage to your computer......... It said problem was coming from: ati2dvag. I later found the files called ati2dvag was in the disk C's systems! So now I can only fly in day. Thats probably why all my screenshots of FlightGear is in Day.