DVR Chatter

I thought I would ask about this problem here rather than in one of the thousand-page threads at the other place.

I finally had Comcast replace my misbehaving first-generation DCT6412 which, three or four times, had spontaneously reset itself and cleared all recordings and all metadata, exactly as if I had performed a Master Reset (which I had not).

When I put in the request I told the CSR that I wanted a box with an HDMI output but I also asked them to note specifically that I wanted a box with a 160GB hard drive (not knowing whether Comcast was even deploying them yet in my area).

To my surprise, the tech showed up with a DCT3416.

So far, so good, though it's certainly too early to tell.  It's only been a few hours.

The problem I'm having now is that I can't capture data from the 3416 on the XP system that I had been using for captures from the 6412.  I re-downloaded the drivers from http://http://replayguide.sourceforge.net/dct6412/ and installed them as described on that page (though the installation messages differed a little from what's described there).

CapDVHS sees the device ("Digital A/V Tuner Device") but the captures aren't usable--it never detects the resolution of the data.  The streams I tried to capture were network broadcasts, which aren't encrypted, so there should be no issue there.

My two questions are:

(1) How can I delete the driver association so that I can start this over again, perhaps with another set of drivers?  (I think I may still have the old drivers around.)

This is just an XP admin question, I realize.

(2) Is there another set of drivers I should be using rather than the ones I downloaded from the above-mentioned page, something that's known to work better with the 3416?  Or are there some additional tweaks I need to apply, or something obvious that I might have overlooked?

Thanks.