Standard VGA graphics adapter?

I have a sony Vaio VGC-LA38G with intel core 2 duo processor(1.83 GHz) and an Nvidia Standard VGA graphics adapter with win7 OS. i even tried updating drivers from Nvidia site but the problem persists. my problem is this graphic card( i dunno if it is the hardware or software) does not support Win7 OS. HELP PLZ. Answers with proper Download links are appreciated. THANKS