Drivers
In computing, a device driver or software driver is a computer program allowing higher-level computer programs to interact with a hardware device.[1]
Graphic (Display) Drivers
It's generally a good idea to have up-to-date graphic card drivers since they tend to fix many problems and increse performance in some games.
nVidia drivers
Visit nVidia drivers page and fill in the form.
AMD / ATI Drivers
Visit ATI Drivers support page and fill in the form.
Related software
DirectX
Microsoft DirectX is a collection of application programming interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms. To update DirectX visit Microsoft Download Center.
Compatibility
Windows 7: DirectX 10, 10.1, 11
Windows XP: DirectX 9.0c
Please note that graphics card needs to be compatibile with DirectX version that you want to use.