Whenever I try to play a game, whether it is World of Warcraft or the basic built-in Chess game (hell, it even happens with Skype sometimes), I get a very weird problem. Everytime I click with my mouse, it is as if it clicks on the application that is running 'behind' the current game. For example, I usually play WoW in windowed mode, but when I try to click on one of the skills my screen flashes and I get a glimpse of my desktop background and it is as if I never clicked on the skill to begin with. What is weird though is that when I initiate Full screen mode and go back to Windowed mode the problem is gone. Does anyone have any ideas what it could be?