you can find the latest graphics driver at the link below:
I Downloaded the driver, when i execute the program, it start extracting the files, after that i get the following message:
Error: The driver being installed is not validated for this computer. Please obtain the appropriate driver from the computer's manufacturer. Setup will exit.
At this point you can either try forcing installing our generic graphics driver via the Have Disk/Known File method from the link below:
or try the original graphics driver from your system manufacturer at the following URL: