I've just applied these tweaks to my arma.cfg file in my docs.
Now the game wont even launch.
The furtherest it will get is the small window box that comes up on screen showing a series of tick boxes to indicate loading progress.
After all the boxes are filled the window disappears, then nothing.
After various reboots and trying to run the beta launch shortcut, and also rebooting and trying the original launch icon from my desktop, the same thing.
I've also tried reverting the settings in the arma.cfg back to the original settings, reboot. Nothing.
In task manager the arma.exe is running with 51% CPU and about 56,000kb of the memory. When the tick box window disappears, the arma.exe will run under processes for about 10/15 seconds and then just disappear.
Im running :-
XFX 8800 GTS 640
1 gig 1066 Corsair twin pair
Abit A9N Fatality Mobo
3400+ AMD AM2 X2 dual core
Windows XP 32bit (SP2)
nVidia drviers 158.22