You need a fast enough processor or sufficient RAM to run the games more smoothly updating the video card won’t help too much. High end games need more fast processing power to run and At least 1 GB of RAM to run the games more smoothly. Even go through the specification of the game how much memory is being needed by them and disk space or higher version of DirectX is also being needed by some game or else check if your graphic setting are being kept at lower level or you can play the game at lower setting and if it works out it might be hardware problem