I'm having the same problem! I'm using version 10.1.219.0 of internet security. Every time I tab out of a fullscreen game it will blow my ear drums out with an annoying sound. It will display a little box in the corner that doesn't say anything of interest(already what you guys posted). I can't find any way to turn it off but to DISABLE gamer mode completely. Nothing else works, it totally ignores ANY changes you make in the alerts.