Sorry for the beginner's question, thanks for helping!
I'm running:
Windows 7 64bit OS
i7cpu
[email protected] with 8GB RAM
ATI Radeon HD 5700 1GB (I think it's a 5770, but don't know how to specifically check that) with updated drivers
BIOS Info:113-c01002-102 (corresponds to the 5770, I think)
on a 19 inch, widescreen 16x10 monitor in 1440x900
In-game, 1440x900 is selected as the monitor resolution, but it's not showing the entire screen. It's equally cut off at all edges (the game picture's not shifted horizontally or vertically, it's centered fine). Weirdly, it's playable in ARMA 2, but with OA the screen is much worse and the game is unplayable. I've tried messing around with different screen ratios and varying the screen resolution with no luck.
I have since tried deleting my .cfg files and that made the problem worse--now the screen is off-center, moving the entire gameplay screen about an inch to the left, and still cutting things off at the edges. I'm going to wait on expert help before I break the darn thing further. Thanks!!