Yep, that's pretty much Windows 7 Media Center in the YouTube video. As I stated in the previous post, if you're looking to get all your channels, you'll need the ATI TV Wonder Digital Cable Tuner and a Cable Card inserted in it from your provider. Otherwise, you're stuck with analog and ClearQAM channels if you go with other tuner options. The ATI model is the only tuner out there at the moment that will allow you to view encrypted channels. Other than that, it's common sense PC stuff. Windows 7 comes with Media Center installed, there are no longer DRM restrictions on it as far as the brand of PC you can use, and just keep in mind that you'll need a semi-fast PC to handle the video processing, along with some nice hard drive storage if you plan to also use it as a MP3 / picture / movie / DVD jukebox also. Media extenders can be used with Media Center for everything other than a DVD jukebox setup, not sure why Microsoft still feels that is an issue.
I'm not sure what you're specifically looking for an answer to. You'll learn the most by playing with it, but here's some very basic instructions for setting up a generic tuner:http://www.hdtvtunerinfo.com/win7mcqamsetup.html
And as I mentioned, in order to get an ATI tuner running for the encrypted channels, you'll also need to also run the Digital Cable Advisor as described here:http://www.anandtech.com/weblog/showpost.aspx?i=655
And this is only for TV tuners.
Again, there's a learning curve for also adding MP3s, DVDs, movies and such, but it's not as steep as the TV tuner setup.
Hope something here helps answer your question...