It is more than likely that Windows 7 already has a drive for your graphics card, but if you are a gamer it is especially important to update your display drivers to make the most out of optimisation and bug fixing improvements.

This article lists the most common video driver download pages, allowing you to periodically check that you have the latest drivers available:

NVIDIA Drivers
ATI Drivers
Intel Graphics Drivers
Matrox Drivers
SIS Drivers
S3 Drivers
Ian, Nov 2, 2009