First, to update your video card drivers , you must know what card and operating system (Windows XP / Vista / 7 and 32/64 bit)you have. This information is available through your DXDIAG, please to see these steps if you do not know your hardware.
To update your Nvidia graphics card, you must go to the Nvidia site and then perform a search :
> Download Nvidia Drivers<
Once these fields are completed, simply click on “Search” and then download the driver offered. When it is downloaded, it will be necessary to install it and restart your computer.
For example, if a graphics card Nvidia Geforce 9800GT on a Windows XP (32bit) :
Product Type: GeForce
Product Series: GeForce 9 Series
Product Range: 9800
Operating system: Windows XP (32bit)
Language: Ensligh (UK or US)
By clicking on Search, the best driver will be offered.