I have windows vista ultimate 64bit. My video scrambles while watching an xvid file, It ONLY scrambles within the video picture itself windows doesn't get scrambled except for the mouse curser. I've tried the 64bit xvid codec and the XviD-1.1.3-28062007. I've tried windows media player & media player classic. I have a geforce 7950 512mb video card with the latest drivers. I've recently installed vista SP1 as well, I still have the problem. I've tried installing FFDSHOW but it would only cause the scramble to occur faster.