you need to tell us what operating system the video card is being used on now. for us to help you find a driver you will have to tell us what computer make/ model you have.
if this is an expansion video card, meaning you can take out the card freely, than tell us the model/ make of the video card instead.
this can be found either printed in text on the motherboard, on the case of the computer, or on the video card itself printed in text also.
examples
DELL MX-642
Nvidia Geforce4 440SE
ATI Radeon 9800
SOYO Dragon Plus KT400