If its Dell, it should be a piece of cake.
http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen
Choose to enter a service tag, and find + enter yours. The service tag will tell them exactly what hardware is in the laptop, and will give you links for all the drivers. Then you just need to scroll down to the video drivers, and there should only be one there.
http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen
Choose to enter a service tag, and find + enter yours. The service tag will tell them exactly what hardware is in the laptop, and will give you links for all the drivers. Then you just need to scroll down to the video drivers, and there should only be one there.