Intel GMA 950 drivers for Latitude 620

About 6 months ago I bought a Latitude D620 that comes with an embedded Intel Graphics Media Accelerator 950 chip. I just discovered for work that I need to access a virtual world developed by Forterra (similar to Second Life), and was told I need to upgrade my graphics drivers to work with Forterra. The latest driver posted by Dell was from Oct 2006 and did not solve my problem. Does anyone have advice or experienced a similar problem?