this is a comment to see how other bf2 users configure za.
Basically on mcAfee I was fine with bf2, it would come up with messages, but these didn't affect bf2 whilst playing.
With za it minimises bf2 (like alt tab). Last time it was a antivirus update that lagged the game and minimised the game.
Problem is za doesn't always minimise fully, as no cursor mouse interaction possible, and bf2 doesn't always go back in fully.
I will try "Game mode" with deny, next time, which I have read should stop it doing the updates and messages.
However seems anoying, that this can't be set on the program setting, to not allow autoupdates.