Graphics problems

[The Cheese]

Hi all, I've been playing Il-2 for quite a while now, but within the last year I've had to install Il-2 46 off of my original disk onto two new Windows 7 64 bit computers, and for some reason, despite being powerful machines with all their drivers and everything, the game will, no matter what I do, refuse to allow "Perfect" landscape graphics (yes I'm using OpenGL) and it also will not allow me to change the screen resolution to 1280x1024 or 1920x1080, using the conf.ini file. But on my old installs of Il-2 on a couple older computers with Windows XP, I'm not having this problem. I'm sort of starting to think it might be a problem with my disk and maybe I should buy another copy of the game from Steam, or there's some issue with Windows 7.

Any idea what my problem might be?