Ok first and foremost we need to make clear what you are doing. And how various devices work.
A TV tuner is a device in a computer that converts a signal into a digital that goes through the computer either as raw data converted by the CPU or as MPEG-2 converted on the card. The data then flows to the video card that processes the data and it is displayed.
An adapter on the fly simply adapts the signal from the source into a way the display can handle.
What many people get confused about is thinking a 20 dollar tuner they got on Ebay will allow them to play their Xbox 360s or NES units on their computer. But that usually does not work unless you like lag and alot of it.
A 50-200 dollar adapter is what you want but I suspect paying a bunch of money is NOT what you had in mind.
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