i'm setting up my pc to my HDTV for the first time using a DVI (from PC) to RCA (TV) cord.

I get no picture at all
the video card i'm using is a EVGA 256-P2-N563-AX GeForce 7900GT

Windows 7
3 GB Ram

the TV only has RCA female connection for HD
do i have to get drivers, and or configure something in the PC in order for me to get a picture ?
i get a picture with the S-Video slot on the same card