I don't know why it happens or what the cause is but my problem is when I start up TF 2 and L4D 2, well it starts up but it just minimizes to the desk top but I can still hear the Valve noise. When I try to open it back up it just minimizes itself, I usually "fix" it by opening the program and then going crazy on my keyboard but I shouldn't have to do this, anyone know what's wrong?