I'm currently in the process of setting up Microsoft Media Center on a Vista 64-bit version. The objectives include connecting to my Home Theatre System and using a TV Capture Card.
I am documenting the process so that:
(a) I can perhaps get some feedback from those more knowledgeable.
(b) When it's all up and running there is a reference for others, who may want to do the same thing.
My paper can be read here.