I didn't really know where to post this, so I posted it here

I am trying to remove macrovision using my computer. I am inputting through my TV Tuner and then outputting through my capture card. The problem is that my capture card makes a border around the video. I know that it is called underscan, but I can't find a way to remove it. I found a program that I could remove the left and right borders (I don't remember which one I used) but couldn't remove the top and bottom.

Does anyone know of a program to completely remove this? Is there a cheap graphics card that doesn't have this?

I am using Mad Dog MX 4000