I don't know what happened here. I am running the EVGA GTX 970 on the latest NVIDIA drivers. I did disabled some windows 7 services in order to fasten windows. I did not touch any graphic services (Guess there aren't any). I am also not sure if that was a reason. Anyway, If I am now moving windows really fast or scrolling down on pages, texts get kind of doubled and shifted over each other until I stop.
Any idea what happened? I reinstalled NVIDIA drivers via checkbox "reinstallation", but nothing has changed.