Minimizing programs problem!

Hey everyone i have having a real problem lately.

im browsing the internet using chrome and the bar at the top gets a lighter colour as it had been minimized.

(it just happend now)

and whenever i am playing games it randomly minimizes my game to the taskbar.

i have searched the internet and most people say it was avg and so did i.

i unistalled avg and installed microsoft security essentials and the problem (again...) still persists!

has anyone had a problem like this one?