This is typical of Pinnacle. They did the same for Xp too. They realsed an update for Pinnacle 9.4.3 or something like that to 9.4.7(?) and it broke it. The forums were rife with anger and fustration as it was supposed to fix a long on-going problem. I too fell for this and ended up re-installing Pinnacle, no small task in itself
One of the teachers has one of these for their personal laptop. Could I get it to work? No... The packaging claims "Windows Vista Certified" but mentions nothing about having to download the Vista version, and that the supplied disk breaks Vista (The disappearing drives issue, reghack required) The downloaded version works though. It seems to install some "additional" programs too.
Further to this, it also claims that it is compatible with Vista Media Center, but after several hours of playing with it, i have come to the conclusion that its not.
I like the Hauppauge kit as it works, and once the supplied software is ditched and media center used, a dream to use (Also with Vista)
Pinnacle have always been awful, I remember using version 7 which did nothing but crash and their forums were FULL of people asking for a fix. They essentially said it was going to be sorted in V8 and we just had to wait.
Awful support and frankly not a great bit of software anyway.