Graphics card help with Windows 7?

I have just upgraded to Windows 7 and it recgonizes my graphics card only as a standard VGA etc. But i have an MSI MX4000-T64 64MB nVidia GeForce AGP 8X Video Card. Whilst on XP it recgonised it straight away. I have tried downloading the driver but says it cannot install as no NVIDIA devices are found. Although i can still watch videos etc very well, i know i am not getting the full use of the card. For example...I cannot use any screen savers as it says my card does not support 3dx. But I know it would if installed! Any ideas? Thankyou, PS i do not have the CD for the card.|||that card wouldn't do much on windows 7.