Go here first:
http://www.intel.com/products/chipsets/gma900/index.htm
Click on:
Get Support and Software
Click on:
Software and drivers
Click on:
Software and drivers
Then click on your choice of:
Get the latest graphics driver - version PV14.25.50 or
Intel® 915 Chipset family information and downloads
Then you must accept the agreement to allow installation of a small utility called
Active X or
Java plug-in Before the Intel Driver Update Utility can analyze this computer you need to give your permission to download an ActiveX or Java Plug-in component called SysReqLab.cab, SRLApplet or System Requirements Lab from Husdawg, LLC
Note: It's safe to allow installation of this very small applet.
Then
click here to choose
automatic detection of your Intel chip. Then you need to click on the big blue high-lighted line that says
Check you system for the latest driver.