You can try upgrading your graphics card driver here:
http://downloadcenter.intel.com/Product_Filter.aspx?ProductID=2102&lang=eng
But you probably just need a nicer graphics card. The one you have is not so great. I'm not a gamer, but you can probably get a decent one for under well under $100 if you don't want to spend a lot. Hardcore gamers will spend hundreds or thousands on good graphics cards to increase their frame rate and make games look better.
