Need help getting KWorld ATSC 115 card to work with Comcast QAM

Hello,

I hooked up a Kworld ATSC 115 (PCI) card to my XP Home (SP2) machine. I got this card because it has QAM (HD) capability, and I wanted to simply plug in my Comcast digital cable coax into the thing and watch the clear QAM channels that they provide, and record shows. I know from others' experiences that Comcast does have a decent handful of unencypted QAM channels.

The problem is, I'll have the Arcsoft TotalMedia software (came bundled with it) scan for channels. It picks up a TON (300 or so). 90%+ are encrypted and locked though, which is what I expected. The problem is, of those that aren't locked, only SEVEN show video when I tune to the channel. The other 20 or so just have the SOUND of the tv show, and no video! It shows a little "radio" icon or symbol, telling me it things it's an radio station, so it doesn't even show a black screen or pixelation. The signal strength bar is FULL!

Of course, when I contact Kworld, they blame Arcsoft, and Arcsoft blames Kworld! Any help would be greatly appreciated. I wish this where simple...just plug in the cable and work!

If it could be the Arcsoft software, does anyone have a suggestion of a third party software that I could use instead that will let me utilize QAM/HD with Windows XP Home, that will function with the KWorld card??