I having a DELL computer with the Windows Vista operating system recently installed the game “Fallout 3”. The game is really great one, but from the last 2 days I am facing a peculiar type of problem, while I run the game, by switching on the NPC then suddenly the game will crashes. But after a while I again able to play the game. A green text is appears in the screen, while I playing the game. Having no idea regarding the problems, any suggestion will be greatly appreciated.