if you video card is pluged into a dark grey slot you could get a nice AIW video card, if you have at least say... ohhh 256MB ram... 512mb would be better and that is usually what I say s the minimum... I have 1GB of ram... IF you find that you have a PCI video card and you are plugged into a white slot, dont worry, just buy a TV tuner card... this would be a cheeper route anyhow... you might want to do this anyways, if your happy with your video card... just go to newegg.com and get the ati tv tuner $60-80 something like that
I have an ASUS Motherboard and the video card is plugged into a brown slot, but definately an AGP slot, I have 1GB of RAM