If you get a good video card these programs will utilize card to process these programs, TV viewing and all that so you can watch tv while playing poker.
a new machine with say a video card like
good TV video card #1 <<<
or even
good tv video card #2
and you should not have any problems running TV cards, poker or anything else except the most resource intensive computer video games.
Also I'd say you can "record" and play poker at the same time with at least a 2.0 ghz processor and 256 mb of ram.
If you are getting a new PC I'm sure the specs will be better than that.