I meant different cable adapter for VGA to composite, not the video card.
Using VGA to VGA would take out any issues with the cable or using a poor connection. Composite is not good at all with a computer signal, the bandwidth is too high for it to handle it well. The monitor would have a VGA input, unless you meant you are using a CRT TV. In which case you need to try different resolutions, maybe use an active adapter like http://www.buy.com/prod/video-converter-s-vga-rca-s-video/223302063.html?listingId=191994101
Although that is a cheap one and may not work too well. A "good" quality converter would cost around $100.