Missing drivers?

Hello, I have been having so many continuous problems with the media display drivers of my Windows vista laptop. Videos cannot play without freezing between seconds and I cannot play any games anymore as my video card seems not to be working either which prevents the screen saver from even running. I have tried installing drivers but I do not have much knowledge as to which one is best for my laptop and I am hoping I can get help here.
My laptop is a toshiba satellite L40-17T. Intel Celeron CPU 540@ 1.86GHz. GMA X3100: 965GM chipset express family: Intel graphics media accelerator. I hope this information is sufficient enough to get me the right answers to solving my problem.Thanx.

Tee-Love