I have a sony vaio desktop with 3.0 Pent-D and vbox external hdtv tuner. X300 graphics card, not sure of tuner card. 1gb ram. I have a roof mounted HDTV antenna and I get all channels on my HDTV. I connected the antenna to my vbox and ran through the MCE Digital signal setup. All channels show 6bars/100% signal strength, however, when watching, all channels hiccup/freeze except my CBS station which is perfect. I tried a new video card (Radeon X800xl) and there was no difference. Any ideas? Thanks Ray Nist