only getting red screen when watching tv or mplayer

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http://ubuntuforums.org – I have an athlon II 3 core system which has a built nvidia 7025 video. The video capture card is a hauppauge hvr-1600 (cx18). I have installed mythbuntu 11.10 64bit and brought all the packages up to date. The nvidia driver is 173 and it is activated and in use. I stepped thru the process of setting up mythbuntu backend with the video card of type IVTV Mpeg-2 encoder card. A video source setup and scanned the channels (which seemed to have been found). lsmod indicates the drivers are up and running for the video capture card. However, when I try watching tv or running mplayer -vo xv (Hardware)