HELP! Can't find NVDIA on my SONY VAIO

hi please help me.

I upgraded my Sony Vaio VGN-Z36GD/J from Windows Vista Business x64 to Windows 7 Professional x64 yesterday.

the problem is the graphic card cannot be detected anymore i tried downloading it from the NVDIA website and when it finished to install it says "Install Cannot Continue"

This is the model of my graphic card before when its still on Vista Business:

NVIDIA® GeForce® 9300M GS notebook graphics processing unit (GPU) (SPEED MODE) / Mobile Intel® Graphics Media Accelerator 4500MHD (STAMINA MODE)

please help me

Hey check first the vaio web site, they had to have suitable drivers for your System Operating.
Also: they advice by a model list of computers if yours are OK to being the "upgrade".
ALSO (if another one agree with me: Vaio Video Cards, are special designed for it; so, theirs a little problem, finding working drivers).

I comment this because i have a VGNFZ-150fe and same problem with drivers doing the downgrade to Xp.
So many hours, and the end., a few hardware was not installed.

Hope you find something at my opinion.
Cheerrrsss ON!