directvtopc is, I believe, the only way you can watch on your pc, so that is how I have been using it. It does NOT stream live tv and it is a stutter machine.
Again, it has been a while, but if I recall correctly, you could most definitely watch live with directv2pc. I did not use it much as I had little need, but the few times I did I recall that being a feature. And a fairly painless, stutter free one at that.
Perhaps current D* subs can correct me.
Edit: did you click the link I gave you before? Is that in fact the program that you are using?