Ok, you have an opportunity for 6 licenses here! :-)
I'm an IT manager at a Dallas Hotel. This past year we put 6 PCs in our Employee Cafeteria for our associate's use. They can surf the net, print, and watch TV via a WinTV HVR-1250 card. The units are Dell Inspirion 530S, with Vista Home Premium, 2GB of RAM.
Our cable system is very odd though. We use OnCommand video (satellite service for hotels). We have that analog signal sent down the the cafeteria and split between the 6 PCs and 2 HDTVs. The card picks up those channels fine.
We also send our Local Digital Channels from our hotel antenna. The TVs in the Cafeteria pick them up fine (albeit tuned to very odd channels, like 107.1, 105.3 etc when they should be 4.1, 5.1, 11.1, etc), but neither the WinTV nor the VMC software can pick up the channels.
I've installed your trial on one of the PCs, and the only way I could get the software to run was to use the following settings:

It tunes the channels, and they all appear to be there (except ABC which is VHF), however I get no audio. Here is my channel listing:

If I can get this working I should be able to convince my boss to buy 6 licenses...the difference between the interlaced analog channel and the digital channel is HUGE when viewed side by side. I just need audio! Is there a particular codec I should download?
Thanks! James