Thanks, I've tried following the instructions there. I installed the driver (which I think I had previously done) according to the instructions successfully. Then I restarted into the A/V wizard and tried to up the level of my UI. Still, the MCE settings said that my driver was "nv" and that it could not generate the UI2 interfaces. I exited to a terminal and manually edited xorg.conf to say "nvidia" instead of "nv." But then when I tried to go into the A/V wizard it wouldn't even start. So now things are back to the way they were, and I am still using the lowest quality interface even though I have a decent graphics card.
One thing to note though - This machine is the only one in my "system." That is to say it is a Media Director too. I noticed something on that page about having to "upgrade the kernel" on a media director. Is this what I will have to do? If so, could someone please provide a little more direction for a novice like me?