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Your gfx card is old and it may take some doing to find drivers. Drivers are usually obtained from 2 sources:
1. The gfx chip makers like nVidia or ATI.
2. The folks who sell you their version of the gfx cards like MSI, Leadtek, PowerColor etc.
Your first bet will always be no.2. This is because these companies will take the cards and supplement/modify them. This means that they also modify the drivers to suit their cards. As such, they are the best resource for gfx drivers.
If you can't get your driver from no.2 or the company has vanished or no longer produces gfx cards (like Genius), then go to no.1. Their drivers are typically listed in their website and can be downloaded.
Then again, your gfx card is old so you may have some difficulty getting a driver. I hope you are successful nonetheless - good luck