Can't select my native resolution

[Danny]

Decided to install the game today since I haven't played it in ages. Went in to ramp up the graphics and for some reason my resolution isn't in the list. I get 640x480x16 up to 1280x1024x16, then I get the same thing x32... my native resolution is 1600x900.

Doubt it's graphics drivers, installed new ones less than a week ago.
Any other suggestions?