I play BF3 on the PC. The game refuses to run in fullscreen mode. I have tried going to the options, alt+enter, checking my catalyst control center, and I do not have teamviwer. My display is 1920x1080. I remember that i was somehow luckily able to run it fullscreen at 1600x900 . However, it did not work again.
Also tried run as admin and compatibility mode for xp.
It annoyed the hell out of me considering that I had no problems with a less powerful computer before I grunted it up. This is what worked for me. All the latest drivers etc, turn the graphics quality down not to ugly but back it away from Ultra ( ASUS 6970 amd). Benefits were better game play, less lag, better mouse responsivessness and generally far more enjoyable. looked at things like netcode and have the registry entry but will not enter it for a bit yet. To cut a long story short reduce the quality, reduce the strain on your machine, not to mention that BF3 is a native of the 32bit world
