Hi guys.
Firstly, this is not on all games... In fact, it only happens on two games i own:
Fable: The Lost Chapters and X3: Reunion (it arrived on thurs, and havent been able to play it because of this)
Anyway, attatched is a screenie of the game window flashing up. It does it every few seconds. Its not drivers. Ive managed to narrow it down to a program running in the background, but i don't know what