I have had a problem with my Arma2, it encounters a glitch which messes up the models, I've run it on every setting, and yes my computer is very capable of running this, I have Arma2 Operation arrowhead which is just as good as this graphic/detail wise and it does not occur. I've reinstalled, verifying integrity of game cache, adding -winxp to the launch properties, and none work. I've been searching for about 2-3 weeks now, and I need help, I can't find a solution, and they cause unplayable lag. Here are 2 pictures of the error:


Whoops too big, help with resizing please?
As you can see, it is a rendering glitch. It only happens after maybe 1-3 hours, or whenever you get helicopters in the Capture the island gamemode, where you build a base, get soldiers for your squad, and capture cities.
I used to fix it by changing anything in the video options that make it re render the game, but now that's not working. So please, if you've encountered this issue and fixed it, please tell me how to fix it.