Type in the Start Menu search bar: device manager
In the Device Manager window find Display Adapter and your video card.
Right click on the video card and choose Update Driver Software.
Choose Search Automatically for Updated Driver software and let it search the internet for you.
Are you trying to run a specific driver update or are drivers already installed? You could always run Windows Update which may pull some driver updates (if previous drivers for the hardware are installed).
Otherwise, you would launch Device Manager and highlight the devices in question, select properties and then "Update Driver."
Should you require additional assistance and guidance, Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams.