Update Mobile Intel 945 Express Chipset Family

So i have a LATITUDE D620 with Mobile Intel® 945 Express Chipset Family as graphic memorie and i cant update it, i use the driver update utility graphics and this what it say : 

A customized computer manufacturer driver is installed on your computer. The Intel Driver Update Utility is not able to update the driver. Installing a generic Intel driver instead of the customized computer manufacturer driver may cause technical issues. Contact your computer manufacturer for the latest driver for your computer.

Help me please