What did happen with my graphic card when I install Win7?

My laptop is HP DV4. Graphic card is Geforce 512MB. Its OS was Vista Home, and rating of VGA was 4.0 marks. But after installing Win7, it is 1.0 mark??? I thinks Win7 not supported all drivers for VGA? I can't solve it. Could you help me? Thanks for reading!

You'll need to download the latest NVIDIA drivers, and as far as I can tell you should have the "512MB NVIDIA GeForce G 105M" graphics card.

Just select that option on this page and download/install the drivers . It should be listed under 100M series.

http://www.nvidia.com/page/drivers.html

Thanks for replying, Admin! Like your suggestion, my graphic card is 512MB NVIDIA GeForce G 105M. I will try to install driver. Thanks again!