Video Card problem

I am running a new PC with Win XP and a Radeon 9800 Pro graphics card. The
card performs fine as you would expect, but when I start MS flight Sim 2004,
the CRT monitor has to be manually adjusted to the correct width and height
settings - when Flight Sim first clicks in, it is occupying perhaps half of
the height and more that the width of the screen. In other words the image
is short and too wide.

Has anyone any ideas as to how to cure this problem. ~It's a nuisance having
to adjust the monitor every time I start Flight Sim and then adjust back
again when I come out of the program.

All suggestions gratefully appreciated

David Morley