i agree , the 8600 is like a pre HD video card. it can do it but it wasnt designed with full HD 1080p apts in mind. windows 7 wasn't even a twinkle in nividia's eye when that card came out. Upgrade to a video card that is HDCP capable and is rated for HD use up to 1080p. For now tweek your resolution settings down to maybe 1280x720 and see if it calms down a bit. if its still gittery go down to the next 16x9 res scale. im running a Nividia 250 GTS its an ok card for how much it costs, i got it for around 140 Canadian dollars.