Iv been playing FO3 on this PC for a very long time at 1440x900 Full screen, Today i decided to try window mode for the first time cause i was bored and i tried it and hated it so i changed it back to full screen.

now when i try to start the game it says Failed to Initialize Renderer and says my display doesnt support the selected resolution,...i go and look and its 1440x900 just where it always is but it refuses to start at the right resolution

but it starts at any resolution lower than 1440x900, or if its set to window mode at 1440x900

how do i make it work with the right resolution full screen mode?