Video Card Tv/out problem

[Warp9Racing]

I have a PNY Geforce 3 ti 200 with s video out. I can get the video out to work but the problem is that i have a 27in JVC television and the desktop when converted over to my tv isnt full screen. I saw other people with graphic cards that produce full screen tc out but mine has black bars on the right and left sides about 2 inches. I tried screwing around with all the settings but nothing works. How can i get it full screen? Is my tv to big? Or is it only certain brand video cards roduce full screen? Please help!