I just put a brand new 7600GT in my computer. If I watch videos like trailers on websites, the video is clear, nice etc. If I watch other types of videos though - like short ones you download from sites, the picture is very dark and hard to make out the video at all. I checked a video I had watched before and even watched it on another computer and it was fine on the others, but all dark on this. Any one know what might be causing that?