commonly VGA onboard driver always packages together with motherboard driver.. try to use device manager on control panel. when u see question mark on VGA driver, insert motherboard driver, right click on VGA driver at device manager. choose update driver, just choose recommended option and click next. your VGA driver will automatically installed. but if u still get trouble try to visit this site:
http://www.asus.com/Motherboards/Intel_Socket_775/P5SMX_SE/
1. choose download tab, then select your operating system.
2. choose what driver that u need, then there will be list of the driver.
3. click download button, there is some option, just choose one.
i hope this helpful. regard, riyan
Direct Driver Download Link >>> VGA Board Driver Link >>> AGP Driver
Just Click and follow the link
Or you can download it from sis website, coz this motherboard uses the SiS 760GX motherboard chipset drivers, which you can download directly from SiS:
you can download the VGA driver for your motherboard D945GAG from the website given below: http://downloadcenter.intel.com/Product_Filter.aspx?ProductID=1672
choose the operating system and download the VGA driver
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