I think this is probuly a simple fix but I don't see it, I have XP pro for a operating system. This just started about a week ago. When watching a movie after about 10 min the screen goes back to the log in screen. I log it & that's ok for another 10 min or so. I went into display & shut all that off so it's not suppose to do anything when Idle but it still goes back to the log in screen....Any ideas as to how to fix this.