I am assuming you have a display using only mobo on-board graphics?
Install and run Everest Home:
This will tell you just about everything you need to know about your fitted graphics card. From this you should be able to find your way to the manufacturers site or elsewhere for the driver.
Have you tried the MS update facility? Sometimes this will find an updated driver for you.
Have you tried updating the driver via Device Manager and letting Windows search the net for a driver?