I stand to be corrected, but I'm pretty sure it's not an issue of being able to accept the HD signal, it's an issue of not being able to decode the digital signal without a set-top box like your PVR.
They have "cable cards" in the US which take the place of the set-top boxes, but to my knowledge aside from FTA gear you won't be able to get a card which works here in Canada so the best you'd be able to do is to feed the signal from your set-top box to your computer and then you'll have to deal with Vista's Draconian DRM protections.
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