To determine which graphic card is installed in your system, press Windows key+R, type
devmgmt.msc and press the Enter key. In Device Manager, you can find the display card model by expanding
Display adapters. Here is an example:-
Now update the driver.
If you have ATI graphics card,visit the following:-
http://support.amd.com/us/Pages/AMDSupportHub.aspx
If you have Nvidia graphics card,visit the following:-
http://www.nvidia.in/Download/index.aspx?lang=en-in
If you have Intel graphics card,visit the following:-
http://tinyurl.com/mx4w3ya
Note: In all the above websites you will find an option which will automatically scan your system and determine the right or appropriate graphics card driver which is required for your system.