Well, you should always install updates which are available because most of the time they contain security fixes and therefore give you more security to you computer. But to check if the DRIVERS are up2date, go to (probs u're using windows7) Computer, then on the top menu System properties, then on the left menu devices manager, now if there's an update available, you should see a left info sign telling you an update is avi. Best would always to double-check that on the provider's homepage. Type in your graphics card and download / install the latest version (if there is one).

/JoNny