You have an onboard Intel graphics device. Its driver is i810.
These drivers may as well be present with the base install you get on the CD's. However you can also download and install them.
Check out the Intel site for these drivers.
Here try out this link :
Graphics Drivers and Linux* Support
Read whatever there is to read on the page and then click on the Download Finder link to download the driver. If read all the instructions properly I guess there should not be any problems with installing the drivers and also do not forget editing your xorg/xf86 file after installing the drivers.
Try this out and post back the results.
Hope this helps.