I require assistance! Mad Dog Multimedia Geforce Fx5200 Ultra.

My graphics card epicly fails. The graphics board looks fine, no burst capacitors, no burn marks, fan works and such.
When playing games or watching video, the card freezes or lags. I am using NVIDIA Drivers. It was the Fx5200 standalone drivers. I later tried the Fx5200 Ultra drivers and it couldn't change resolution (said my VGA monitor was connected to Svideo).
Help please?
(I know mad dog multimedia was a ripoff company from Compusa)