i hav had fallout 3 for 2 years now, and i hav finished it a number of times, but when i reinstilled the game today, at the launch menu, when i click play, it loads and loads then the curser turns to a disk, nothing happens for a while then the launcher menu pops up again, the game wont start, plz help me

Did you make sure to delete the Fallout.ini located in My Documents>My Games>Fallout?

yeah the folder is empty