I have problem with my Diamond Viper Card. Please HEEEEEELLPPP!

After installing Fifa 2000, I went to setup the 3d card. It had recognized my Diamond Viper V550 for Windows Card. But in the match it refused to show me anything and it showed only a white screen. The sound, however, did play well. Also, when I use the graphics renderer 'Software rendered' the game plays but with very low graphics. What should I do to solve my problem? KOM
A GREEK BOY!