Hi RocketRacer,
Any drivers released and supported by Sony are available on the Support site.
http://www.sony.co.uk/support/en/product/VGN-FZ31M/updates
Unfortunately Sony only update graphics drivers if there is a major problem. If you need an updated driver for gaming or other software requirements you will need to utilize a third party supplier that provides a modified INF file that will allow the unified Nvidia driver to install on your OEM system.
If you wish to take this route at your own risk then follow this link and read the quickstart guide.
http://www.laptopvideo2go.com/
Rich
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